mirror of
https://github.com/holub/mame
synced 2025-10-06 09:00:04 +03:00

Update MAME to use new function Instantiate ODR-used static constant members Make some of the UI code more localisable Remove use of retired functions in tools
1124 lines
39 KiB
C++
1124 lines
39 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Tony La Porta
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/**************************************************************************\
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* Microchip PIC16C5x Emulator *
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* *
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* Copyright Tony La Porta *
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* Originally written for the MAME project. *
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* *
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* *
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* Addressing architecture is based on the Harvard addressing scheme. *
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* *
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* *
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* **** Change Log **** *
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* TLP (06-Apr-2003) *
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* - First Public release. *
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* BO (07-Apr-2003) Ver 1.01 *
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* - Renamed 'sleep' function to 'sleepic' to avoid C conflicts. *
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* TLP (09-Apr-2003) Ver 1.10 *
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* - Fixed modification of file register $03 (Status). *
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* - Corrected support for 7FFh (12-bit) size ROMs. *
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* - The 'call' and 'goto' instructions weren't correctly handling the *
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* STATUS page info correctly. *
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* - The FSR register was incorrectly oring the data with 0xe0 when read. *
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* - Prescaler masking information was set to 3 instead of 7. *
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* - Prescaler assign bit was set to 4 instead of 8. *
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* - Timer source and edge select flags/masks were wrong. *
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* - Corrected the memory bank selection in GET/SET_REGFILE and also the *
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* indirect register addressing. *
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* BMP (18-May-2003) Ver 1.11 *
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* - pic16c5x_get_reg functions were missing 'returns'. *
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* TLP (27-May-2003) Ver 1.12 *
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* - Fixed the WatchDog timer count. *
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* - The Prescaler rate was incorrectly being zeroed, instead of the *
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* actual Prescaler counter in the CLRWDT and SLEEP instructions. *
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* - Added masking to the FSR register. Upper unused bits are always 1. *
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* TLP (27-Aug-2009) Ver 1.13 *
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* - Indirect addressing was not taking into account special purpose *
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* memory mapped locations. *
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* - 'iorlw' instruction was saving the result to memory instead of *
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* the W register. *
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* - 'tris' instruction no longer modifies Port-C on PIC models that *
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* do not have Port-C implemented. *
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* TLP (07-Sep-2009) Ver 1.14 *
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* - Edge sense control for the T0 count input was incorrectly reversed *
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* *
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* *
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* **** Notes: **** *
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* PIC WatchDog Timer has a separate internal clock. For the moment, we're *
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* basing the count on a 4MHz input clock, since 4MHz is the typical *
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* input frequency (but by no means always). *
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* A single scaler is available for the Counter/Timer or WatchDog Timer. *
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* When connected to the Counter/Timer, it functions as a Prescaler, *
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* hence prescale overflows, tick the Counter/Timer. *
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* When connected to the WatchDog Timer, it functions as a Postscaler *
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* hence WatchDog Timer overflows, tick the Postscaler. This scenario *
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* means that the WatchDog timeout occurs when the Postscaler has *
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* reached the scaler rate value, not when the WatchDog reaches zero. *
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* CLRWDT should prevent the WatchDog Timer from timing out and generating *
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* a device reset, but how is not known. The manual also mentions that *
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* the WatchDog Timer can only be disabled during ROM programming, and *
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* no other means seem to exist??? *
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* *
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\**************************************************************************/
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#include "emu.h"
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#include "debugger.h"
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#include "pic16c5x.h"
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const device_type PIC16C54 = &device_creator<pic16c54_device>;
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const device_type PIC16C55 = &device_creator<pic16c55_device>;
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const device_type PIC16C56 = &device_creator<pic16c56_device>;
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const device_type PIC16C57 = &device_creator<pic16c57_device>;
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const device_type PIC16C58 = &device_creator<pic16c58_device>;
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/****************************************************************************
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* Internal Memory Maps
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****************************************************************************/
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static ADDRESS_MAP_START( pic16c5x_rom_9, AS_PROGRAM, 16, pic16c5x_device )
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AM_RANGE(0x000, 0x1ff) AM_ROM
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( pic16c5x_ram_5, AS_DATA, 8, pic16c5x_device )
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AM_RANGE(0x00, 0x07) AM_RAM
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AM_RANGE(0x08, 0x0f) AM_RAM
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AM_RANGE(0x10, 0x1f) AM_RAM
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( pic16c5x_rom_10, AS_PROGRAM, 16, pic16c5x_device )
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AM_RANGE(0x000, 0x3ff) AM_ROM
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( pic16c5x_rom_11, AS_PROGRAM, 16, pic16c5x_device )
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AM_RANGE(0x000, 0x7ff) AM_ROM
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( pic16c5x_ram_7, AS_DATA, 8, pic16c5x_device )
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AM_RANGE(0x00, 0x07) AM_RAM AM_MIRROR(0x60)
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AM_RANGE(0x08, 0x0f) AM_RAM AM_MIRROR(0x60)
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AM_RANGE(0x10, 0x1f) AM_RAM
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AM_RANGE(0x30, 0x3f) AM_RAM
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AM_RANGE(0x50, 0x5f) AM_RAM
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AM_RANGE(0x70, 0x7f) AM_RAM
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ADDRESS_MAP_END
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pic16c5x_device::pic16c5x_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, int program_width, int data_width, int picmodel)
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: cpu_device(mconfig, type, name, tag, owner, clock, shortname, __FILE__)
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, m_program_config("program", ENDIANNESS_LITTLE, 16, program_width, -1
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, ( ( program_width == 9 ) ? ADDRESS_MAP_NAME(pic16c5x_rom_9) : ( ( program_width == 10 ) ? ADDRESS_MAP_NAME(pic16c5x_rom_10) : ADDRESS_MAP_NAME(pic16c5x_rom_11) )))
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, m_data_config("data", ENDIANNESS_LITTLE, 8, data_width, 0
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, ( ( data_width == 5 ) ? ADDRESS_MAP_NAME(pic16c5x_ram_5) : ADDRESS_MAP_NAME(pic16c5x_ram_7) ) )
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, m_reset_vector((program_width == 9) ? 0x1ff : ((program_width == 10) ? 0x3ff : 0x7ff))
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, m_picmodel(picmodel)
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, m_temp_config(0)
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, m_picRAMmask((data_width == 5) ? 0x1f : 0x7f)
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, m_read_a(*this)
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, m_read_b(*this)
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, m_read_c(*this)
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, m_write_a(*this)
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, m_write_b(*this)
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, m_write_c(*this)
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, m_read_t0(*this)
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{
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}
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pic16c54_device::pic16c54_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: pic16c5x_device(mconfig, PIC16C54, "PIC16C54", tag, owner, clock, "pic16c54", 9, 5, 0x16C54)
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{
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}
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pic16c55_device::pic16c55_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: pic16c5x_device(mconfig, PIC16C55, "PIC16C55", tag, owner, clock, "pic16c55", 9, 5, 0x16C55)
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{
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}
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pic16c56_device::pic16c56_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: pic16c5x_device(mconfig, PIC16C56, "PIC16C56", tag, owner, clock, "pic16c56", 10, 5, 0x16C56)
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{
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}
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pic16c57_device::pic16c57_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: pic16c5x_device(mconfig, PIC16C57, "PIC16C57", tag, owner, clock, "pic16c57", 11, 7, 0x16C57)
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{
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}
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pic16c58_device::pic16c58_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: pic16c5x_device(mconfig, PIC16C58, "PIC16C58", tag, owner, clock, "pic16c58", 11, 7, 0x16C58)
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{
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}
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offs_t pic16c5x_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
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{
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extern CPU_DISASSEMBLE( pic16c5x );
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return CPU_DISASSEMBLE_NAME(pic16c5x)(this, buffer, pc, oprom, opram, options);
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}
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void pic16c5x_device::update_internalram_ptr()
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{
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m_internalram = (UINT8 *)m_data->get_write_ptr(0x00);
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}
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#define PIC16C5x_RDOP(A) (m_direct->read_word((A)<<1))
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#define PIC16C5x_RAM_RDMEM(A) ((UINT8)m_data->read_byte(A))
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#define PIC16C5x_RAM_WRMEM(A,V) (m_data->write_byte(A,V))
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#define M_RDRAM(A) (((A) < 8) ? m_internalram[A] : PIC16C5x_RAM_RDMEM(A))
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#define M_WRTRAM(A,V) do { if ((A) < 8) m_internalram[A] = (V); else PIC16C5x_RAM_WRMEM(A,V); } while (0)
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#define M_RDOP(A) PIC16C5x_RDOP(A)
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#define ADDR_MASK 0x7ff
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#define TMR0 m_internalram[1]
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#define PCL m_internalram[2]
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#define STATUS m_internalram[3]
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#define FSR m_internalram[4]
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#define PORTA m_internalram[5]
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#define PORTB m_internalram[6]
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#define PORTC m_internalram[7]
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#define INDF M_RDRAM(FSR)
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#define ADDR (m_opcode.b.l & 0x1f)
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#define RISING_EDGE_T0 (( (int)(T0_in - m_old_T0) > 0) ? 1 : 0)
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#define FALLING_EDGE_T0 (( (int)(T0_in - m_old_T0) < 0) ? 1 : 0)
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/******** The following is the Status Flag register definition. *********/
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/* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | */
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/* | PA | TO | PD | Z | DC | C | */
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#define PA_REG 0xe0 /* PA Program Page Preselect - bit 8 is unused here */
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#define TO_FLAG 0x10 /* TO Time Out flag (WatchDog) */
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#define PD_FLAG 0x08 /* PD Power Down flag */
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#define Z_FLAG 0x04 /* Z Zero Flag */
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#define DC_FLAG 0x02 /* DC Digit Carry/Borrow flag (Nibble) */
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#define C_FLAG 0x01 /* C Carry/Borrow Flag (Byte) */
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#define PA (STATUS & PA_REG)
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#define TO (STATUS & TO_FLAG)
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#define PD (STATUS & PD_FLAG)
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#define ZERO (STATUS & Z_FLAG)
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#define DC (STATUS & DC_FLAG)
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#define CARRY (STATUS & C_FLAG)
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/******** The following is the Option Flag register definition. *********/
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/* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | */
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/* | 0 | 0 | TOCS | TOSE | PSA | PS | */
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#define T0CS_FLAG 0x20 /* TOCS Timer 0 clock source select */
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#define T0SE_FLAG 0x10 /* TOSE Timer 0 clock source edge select */
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#define PSA_FLAG 0x08 /* PSA Prescaler Assignment bit */
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#define PS_REG 0x07 /* PS Prescaler Rate select */
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#define T0CS (m_OPTION & T0CS_FLAG)
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#define T0SE (m_OPTION & T0SE_FLAG)
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#define PSA (m_OPTION & PSA_FLAG)
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#define PS (m_OPTION & PS_REG)
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/******** The following is the Config Flag register definition. *********/
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/* | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | */
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/* | CP | WDTE | FOSC | */
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/* CP Code Protect (ROM read protect) */
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#define WDTE_FLAG 0x04 /* WDTE WatchDog Timer enable */
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#define FOSC_FLAG 0x03 /* FOSC Oscillator source select */
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#define WDTE (m_CONFIG & WDTE_FLAG)
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#define FOSC (m_CONFIG & FOSC_FLAG)
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/************************************************************************
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* Shortcuts
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************************************************************************/
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#define CLR(flagreg, flag) ( flagreg &= (UINT8)(~flag) )
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#define SET(flagreg, flag) ( flagreg |= flag )
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/* Easy bit position selectors */
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#define POS ((m_opcode.b.l >> 5) & 7)
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static const unsigned int bit_clr[8] = { 0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f };
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static const unsigned int bit_set[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
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void pic16c5x_device::CALCULATE_Z_FLAG()
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{
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if (m_ALU == 0) SET(STATUS, Z_FLAG);
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else CLR(STATUS, Z_FLAG);
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}
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void pic16c5x_device::CALCULATE_ADD_CARRY()
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{
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if ((UINT8)(m_old_data) > (UINT8)(m_ALU)) {
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SET(STATUS, C_FLAG);
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}
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else {
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CLR(STATUS, C_FLAG);
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}
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}
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void pic16c5x_device::CALCULATE_ADD_DIGITCARRY()
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{
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if (((UINT8)(m_old_data) & 0x0f) > ((UINT8)(m_ALU) & 0x0f)) {
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SET(STATUS, DC_FLAG);
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}
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else {
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CLR(STATUS, DC_FLAG);
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}
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}
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void pic16c5x_device::CALCULATE_SUB_CARRY()
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{
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if ((UINT8)(m_old_data) < (UINT8)(m_ALU)) {
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CLR(STATUS, C_FLAG);
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}
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else {
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SET(STATUS, C_FLAG);
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}
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}
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void pic16c5x_device::CALCULATE_SUB_DIGITCARRY()
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{
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if (((UINT8)(m_old_data) & 0x0f) < ((UINT8)(m_ALU) & 0x0f)) {
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CLR(STATUS, DC_FLAG);
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}
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else {
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SET(STATUS, DC_FLAG);
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}
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}
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UINT16 pic16c5x_device::POP_STACK()
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{
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UINT16 data = m_STACK[1];
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m_STACK[1] = m_STACK[0];
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return (data & ADDR_MASK);
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}
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void pic16c5x_device::PUSH_STACK(UINT16 data)
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{
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m_STACK[0] = m_STACK[1];
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m_STACK[1] = (data & ADDR_MASK);
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}
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UINT8 pic16c5x_device::GET_REGFILE(offs_t addr) /* Read from internal memory */
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{
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UINT8 data;
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if (addr == 0) { /* Indirect addressing */
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addr = (FSR & m_picRAMmask);
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}
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if ((m_picmodel == 0x16C57) || (m_picmodel == 0x16C58)) {
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addr |= (FSR & 0x60); /* FSR bits 6-5 are used for banking in direct mode */
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}
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if ((addr & 0x10) == 0) addr &= 0x0f;
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switch(addr)
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{
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case 00: /* Not an actual register, so return 0 */
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data = 0;
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break;
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case 04: data = (FSR | (UINT8)(~m_picRAMmask));
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break;
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case 05: data = m_read_a(PIC16C5x_PORTA, 0xff);
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data &= m_TRISA;
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data |= ((UINT8)(~m_TRISA) & PORTA);
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data &= 0x0f; /* 4-bit port (only lower 4 bits used) */
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break;
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case 06: data = m_read_b(PIC16C5x_PORTB, 0xff);
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data &= m_TRISB;
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data |= ((UINT8)(~m_TRISB) & PORTB);
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break;
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case 07: if ((m_picmodel == 0x16C55) || (m_picmodel == 0x16C57)) {
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data = m_read_c(PIC16C5x_PORTC, 0xff);
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data &= m_TRISC;
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data |= ((UINT8)(~m_TRISC) & PORTC);
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}
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else { /* PIC16C54, PIC16C56, PIC16C58 */
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data = M_RDRAM(addr);
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}
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break;
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default: data = M_RDRAM(addr);
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break;
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}
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return data;
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}
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void pic16c5x_device::STORE_REGFILE(offs_t addr, UINT8 data) /* Write to internal memory */
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{
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if (addr == 0) { /* Indirect addressing */
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addr = (FSR & m_picRAMmask);
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}
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if ((m_picmodel == 0x16C57) || (m_picmodel == 0x16C58)) {
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addr |= (FSR & 0x60); /* FSR bits 6-5 are used for banking in direct mode */
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}
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if ((addr & 0x10) == 0) addr &= 0x0f;
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switch(addr)
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{
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case 00: /* Not an actual register, nothing to save */
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break;
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case 01: m_delay_timer = 2; /* Timer starts after next two instructions */
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if (PSA == 0) m_prescaler = 0; /* Must clear the Prescaler */
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TMR0 = data;
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break;
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case 02: PCL = data;
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m_PC = ((STATUS & PA_REG) << 4) | data;
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break;
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case 03: STATUS &= (UINT8)(~PA_REG); STATUS |= (data & PA_REG);
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break;
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case 04: FSR = (data | (UINT8)(~m_picRAMmask));
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break;
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case 05: data &= 0x0f; /* 4-bit port (only lower 4 bits used) */
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m_write_a(PIC16C5x_PORTA, data & (UINT8)(~m_TRISA), 0xff);
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PORTA = data;
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break;
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case 06: m_write_b(PIC16C5x_PORTB, data & (UINT8)(~m_TRISB), 0xff);
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PORTB = data;
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break;
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case 07: if ((m_picmodel == 0x16C55) || (m_picmodel == 0x16C57)) {
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m_write_c(PIC16C5x_PORTC, data & (UINT8)(~m_TRISC), 0xff);
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PORTC = data;
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}
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else { /* PIC16C54, PIC16C56, PIC16C58 */
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M_WRTRAM(addr, data);
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}
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break;
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default: M_WRTRAM(addr, data);
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break;
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}
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}
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void pic16c5x_device::STORE_RESULT(offs_t addr, UINT8 data)
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{
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if (m_opcode.b.l & 0x20)
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{
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STORE_REGFILE(addr, data);
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}
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else
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{
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m_W = data;
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}
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}
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/************************************************************************
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* Emulate the Instructions
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************************************************************************/
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/* This following function is here to fill in the void for */
|
|
/* the opcode call function. This function is never called. */
|
|
|
|
|
|
void pic16c5x_device::illegal()
|
|
{
|
|
logerror("PIC16C5x: PC=%03x, Illegal opcode = %04x\n", (m_PC-1), m_opcode.w.l);
|
|
}
|
|
|
|
|
|
void pic16c5x_device::addwf()
|
|
{
|
|
m_old_data = GET_REGFILE(ADDR);
|
|
m_ALU = m_old_data + m_W;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
CALCULATE_ADD_CARRY();
|
|
CALCULATE_ADD_DIGITCARRY();
|
|
}
|
|
|
|
void pic16c5x_device::andwf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) & m_W;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::andlw()
|
|
{
|
|
m_ALU = m_opcode.b.l & m_W;
|
|
m_W = m_ALU;
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::bcf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR);
|
|
m_ALU &= bit_clr[POS];
|
|
STORE_REGFILE(ADDR, m_ALU);
|
|
}
|
|
|
|
void pic16c5x_device::bsf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR);
|
|
m_ALU |= bit_set[POS];
|
|
STORE_REGFILE(ADDR, m_ALU);
|
|
}
|
|
|
|
void pic16c5x_device::btfss()
|
|
{
|
|
if ((GET_REGFILE(ADDR) & bit_set[POS]) == bit_set[POS])
|
|
{
|
|
m_PC++ ;
|
|
PCL = m_PC & 0xff;
|
|
m_inst_cycles += 1; /* Add NOP cycles */
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::btfsc()
|
|
{
|
|
if ((GET_REGFILE(ADDR) & bit_set[POS]) == 0)
|
|
{
|
|
m_PC++ ;
|
|
PCL = m_PC & 0xff;
|
|
m_inst_cycles += 1; /* Add NOP cycles */
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::call()
|
|
{
|
|
PUSH_STACK(m_PC);
|
|
m_PC = ((STATUS & PA_REG) << 4) | m_opcode.b.l;
|
|
m_PC &= 0x6ff;
|
|
PCL = m_PC & 0xff;
|
|
}
|
|
|
|
void pic16c5x_device::clrw()
|
|
{
|
|
m_W = 0;
|
|
SET(STATUS, Z_FLAG);
|
|
}
|
|
|
|
void pic16c5x_device::clrf()
|
|
{
|
|
STORE_REGFILE(ADDR, 0);
|
|
SET(STATUS, Z_FLAG);
|
|
}
|
|
|
|
void pic16c5x_device::clrwdt()
|
|
{
|
|
m_WDT = 0;
|
|
if (PSA) m_prescaler = 0;
|
|
SET(STATUS, TO_FLAG);
|
|
SET(STATUS, PD_FLAG);
|
|
}
|
|
|
|
void pic16c5x_device::comf()
|
|
{
|
|
m_ALU = (UINT8)(~(GET_REGFILE(ADDR)));
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::decf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) - 1;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::decfsz()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) - 1;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
if (m_ALU == 0)
|
|
{
|
|
m_PC++ ;
|
|
PCL = m_PC & 0xff;
|
|
m_inst_cycles += 1; /* Add NOP cycles */
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::goto_op()
|
|
{
|
|
m_PC = ((STATUS & PA_REG) << 4) | (m_opcode.w.l & 0x1ff);
|
|
m_PC &= ADDR_MASK;
|
|
PCL = m_PC & 0xff;
|
|
}
|
|
|
|
void pic16c5x_device::incf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) + 1;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::incfsz()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) + 1;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
if (m_ALU == 0)
|
|
{
|
|
m_PC++ ;
|
|
PCL = m_PC & 0xff;
|
|
m_inst_cycles += 1; /* Add NOP cycles */
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::iorlw()
|
|
{
|
|
m_ALU = m_opcode.b.l | m_W;
|
|
m_W = m_ALU;
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::iorwf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) | m_W;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::movf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR);
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::movlw()
|
|
{
|
|
m_W = m_opcode.b.l;
|
|
}
|
|
|
|
void pic16c5x_device::movwf()
|
|
{
|
|
STORE_REGFILE(ADDR, m_W);
|
|
}
|
|
|
|
void pic16c5x_device::nop()
|
|
{
|
|
/* Do nothing */
|
|
}
|
|
|
|
void pic16c5x_device::option()
|
|
{
|
|
m_OPTION = m_W & (T0CS_FLAG | T0SE_FLAG | PSA_FLAG | PS_REG);
|
|
}
|
|
|
|
void pic16c5x_device::retlw()
|
|
{
|
|
m_W = m_opcode.b.l;
|
|
m_PC = POP_STACK();
|
|
PCL = m_PC & 0xff;
|
|
}
|
|
|
|
void pic16c5x_device::rlf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR);
|
|
m_ALU <<= 1;
|
|
if (STATUS & C_FLAG) m_ALU |= 1;
|
|
if (GET_REGFILE(ADDR) & 0x80) SET(STATUS, C_FLAG);
|
|
else CLR(STATUS, C_FLAG);
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
}
|
|
|
|
void pic16c5x_device::rrf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR);
|
|
m_ALU >>= 1;
|
|
if (STATUS & C_FLAG) m_ALU |= 0x80;
|
|
if (GET_REGFILE(ADDR) & 1) SET(STATUS, C_FLAG);
|
|
else CLR(STATUS, C_FLAG);
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
}
|
|
|
|
void pic16c5x_device::sleepic()
|
|
{
|
|
if (WDTE) m_WDT = 0;
|
|
if (PSA) m_prescaler = 0;
|
|
SET(STATUS, TO_FLAG);
|
|
CLR(STATUS, PD_FLAG);
|
|
}
|
|
|
|
void pic16c5x_device::subwf()
|
|
{
|
|
m_old_data = GET_REGFILE(ADDR);
|
|
m_ALU = m_old_data - m_W;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
CALCULATE_SUB_CARRY();
|
|
CALCULATE_SUB_DIGITCARRY();
|
|
}
|
|
|
|
void pic16c5x_device::swapf()
|
|
{
|
|
m_ALU = ((GET_REGFILE(ADDR) << 4) & 0xf0);
|
|
m_ALU |= ((GET_REGFILE(ADDR) >> 4) & 0x0f);
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
}
|
|
|
|
void pic16c5x_device::tris()
|
|
{
|
|
switch(m_opcode.b.l & 0x7)
|
|
{
|
|
case 05: if (m_TRISA == m_W) break;
|
|
else { m_TRISA = m_W | 0xf0; m_write_a(PIC16C5x_PORTA, PORTA & (UINT8)(~m_TRISA) & 0x0f, 0xff); break; }
|
|
case 06: if (m_TRISB == m_W) break;
|
|
else { m_TRISB = m_W; m_write_b(PIC16C5x_PORTB, PORTB & (UINT8)(~m_TRISB), 0xff); break; }
|
|
case 07: if ((m_picmodel == 0x16C55) || (m_picmodel == 0x16C57)) {
|
|
if (m_TRISC == m_W) break;
|
|
else { m_TRISC = m_W; m_write_c(PIC16C5x_PORTC, PORTC & (UINT8)(~m_TRISC), 0xff); break; }
|
|
}
|
|
else {
|
|
illegal(); break;
|
|
}
|
|
default: illegal(); break;
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::xorlw()
|
|
{
|
|
m_ALU = m_W ^ m_opcode.b.l;
|
|
m_W = m_ALU;
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
void pic16c5x_device::xorwf()
|
|
{
|
|
m_ALU = GET_REGFILE(ADDR) ^ m_W;
|
|
STORE_RESULT(ADDR, m_ALU);
|
|
CALCULATE_Z_FLAG();
|
|
}
|
|
|
|
|
|
|
|
|
|
/***********************************************************************
|
|
* Opcode Table (Cycles, Instruction)
|
|
***********************************************************************/
|
|
|
|
const pic16c5x_device::pic16c5x_opcode pic16c5x_device::s_opcode_main[256]=
|
|
{
|
|
/*00*/ {1, &pic16c5x_device::nop },{0, &pic16c5x_device::illegal },{1, &pic16c5x_device::movwf },{1, &pic16c5x_device::movwf },
|
|
{1, &pic16c5x_device::clrw },{0, &pic16c5x_device::illegal },{1, &pic16c5x_device::clrf },{1, &pic16c5x_device::clrf },
|
|
/*08*/ {1, &pic16c5x_device::subwf },{1, &pic16c5x_device::subwf },{1, &pic16c5x_device::subwf },{1, &pic16c5x_device::subwf },
|
|
{1, &pic16c5x_device::decf },{1, &pic16c5x_device::decf },{1, &pic16c5x_device::decf },{1, &pic16c5x_device::decf },
|
|
/*10*/ {1, &pic16c5x_device::iorwf },{1, &pic16c5x_device::iorwf },{1, &pic16c5x_device::iorwf },{1, &pic16c5x_device::iorwf },
|
|
{1, &pic16c5x_device::andwf },{1, &pic16c5x_device::andwf },{1, &pic16c5x_device::andwf },{1, &pic16c5x_device::andwf },
|
|
/*18*/ {1, &pic16c5x_device::xorwf },{1, &pic16c5x_device::xorwf },{1, &pic16c5x_device::xorwf },{1, &pic16c5x_device::xorwf },
|
|
{1, &pic16c5x_device::addwf },{1, &pic16c5x_device::addwf },{1, &pic16c5x_device::addwf },{1, &pic16c5x_device::addwf },
|
|
/*20*/ {1, &pic16c5x_device::movf },{1, &pic16c5x_device::movf },{1, &pic16c5x_device::movf },{1, &pic16c5x_device::movf },
|
|
{1, &pic16c5x_device::comf },{1, &pic16c5x_device::comf },{1, &pic16c5x_device::comf },{1, &pic16c5x_device::comf },
|
|
/*28*/ {1, &pic16c5x_device::incf },{1, &pic16c5x_device::incf },{1, &pic16c5x_device::incf },{1, &pic16c5x_device::incf },
|
|
{1, &pic16c5x_device::decfsz },{1, &pic16c5x_device::decfsz },{1, &pic16c5x_device::decfsz },{1, &pic16c5x_device::decfsz },
|
|
/*30*/ {1, &pic16c5x_device::rrf },{1, &pic16c5x_device::rrf },{1, &pic16c5x_device::rrf },{1, &pic16c5x_device::rrf },
|
|
{1, &pic16c5x_device::rlf },{1, &pic16c5x_device::rlf },{1, &pic16c5x_device::rlf },{1, &pic16c5x_device::rlf },
|
|
/*38*/ {1, &pic16c5x_device::swapf },{1, &pic16c5x_device::swapf },{1, &pic16c5x_device::swapf },{1, &pic16c5x_device::swapf },
|
|
{1, &pic16c5x_device::incfsz },{1, &pic16c5x_device::incfsz },{1, &pic16c5x_device::incfsz },{1, &pic16c5x_device::incfsz },
|
|
/*40*/ {1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },
|
|
{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },
|
|
/*48*/ {1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },
|
|
{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },{1, &pic16c5x_device::bcf },
|
|
/*50*/ {1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },
|
|
{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },
|
|
/*58*/ {1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },
|
|
{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },{1, &pic16c5x_device::bsf },
|
|
/*60*/ {1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },
|
|
{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },
|
|
/*68*/ {1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },
|
|
{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },{1, &pic16c5x_device::btfsc },
|
|
/*70*/ {1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },
|
|
{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },
|
|
/*78*/ {1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },
|
|
{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },{1, &pic16c5x_device::btfss },
|
|
/*80*/ {2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },
|
|
{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },
|
|
/*88*/ {2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },
|
|
{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },{2, &pic16c5x_device::retlw },
|
|
/*90*/ {2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },
|
|
{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },
|
|
/*98*/ {2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },
|
|
{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },{2, &pic16c5x_device::call },
|
|
/*A0*/ {2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
/*A8*/ {2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
/*B0*/ {2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
/*B8*/ {2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },{2, &pic16c5x_device::goto_op },
|
|
/*C0*/ {1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },
|
|
{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },
|
|
/*C8*/ {1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },
|
|
{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },{1, &pic16c5x_device::movlw },
|
|
/*D0*/ {1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },
|
|
{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },
|
|
/*D8*/ {1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },
|
|
{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },{1, &pic16c5x_device::iorlw },
|
|
/*E0*/ {1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },
|
|
{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },
|
|
/*E8*/ {1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },
|
|
{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },{1, &pic16c5x_device::andlw },
|
|
/*F0*/ {1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },
|
|
{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },
|
|
/*F8*/ {1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },
|
|
{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw },{1, &pic16c5x_device::xorlw }
|
|
};
|
|
|
|
|
|
const pic16c5x_device::pic16c5x_opcode pic16c5x_device::s_opcode_00x[16]=
|
|
{
|
|
/*00*/ {1, &pic16c5x_device::nop },{0, &pic16c5x_device::illegal },{1, &pic16c5x_device::option },{1, &pic16c5x_device::sleepic },
|
|
{1, &pic16c5x_device::clrwdt },{1, &pic16c5x_device::tris },{1, &pic16c5x_device::tris },{1, &pic16c5x_device::tris },
|
|
/*08*/ {0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal },
|
|
{0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal },{0, &pic16c5x_device::illegal }
|
|
};
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
* Inits CPU emulation
|
|
****************************************************************************/
|
|
|
|
enum
|
|
{
|
|
PIC16C5x_PC=1, PIC16C5x_STK0, PIC16C5x_STK1, PIC16C5x_FSR,
|
|
PIC16C5x_W, PIC16C5x_ALU, PIC16C5x_STR, PIC16C5x_OPT,
|
|
PIC16C5x_TMR0, PIC16C5x_PRTA, PIC16C5x_PRTB, PIC16C5x_PRTC,
|
|
PIC16C5x_WDT, PIC16C5x_TRSA, PIC16C5x_TRSB, PIC16C5x_TRSC,
|
|
PIC16C5x_PSCL
|
|
};
|
|
|
|
void pic16c5x_device::device_start()
|
|
{
|
|
m_program = &space(AS_PROGRAM);
|
|
m_direct = &m_program->direct();
|
|
m_data = &space(AS_DATA);
|
|
|
|
m_read_a.resolve_safe(0);
|
|
m_read_b.resolve_safe(0);
|
|
m_read_c.resolve_safe(0);
|
|
m_write_a.resolve_safe();
|
|
m_write_b.resolve_safe();
|
|
m_write_c.resolve_safe();
|
|
m_read_t0.resolve_safe(0);
|
|
|
|
/* ensure the internal ram pointers are set before get_info is called */
|
|
update_internalram_ptr();
|
|
|
|
save_item(NAME(m_W));
|
|
save_item(NAME(m_ALU));
|
|
save_item(NAME(m_OPTION));
|
|
save_item(NAME(TMR0));
|
|
save_item(NAME(PCL));
|
|
save_item(NAME(STATUS));
|
|
save_item(NAME(FSR));
|
|
save_item(NAME(PORTA));
|
|
save_item(NAME(PORTB));
|
|
save_item(NAME(PORTC));
|
|
save_item(NAME(m_TRISA));
|
|
save_item(NAME(m_TRISB));
|
|
save_item(NAME(m_TRISC));
|
|
save_item(NAME(m_old_T0));
|
|
save_item(NAME(m_old_data));
|
|
save_item(NAME(m_picRAMmask));
|
|
save_item(NAME(m_WDT));
|
|
save_item(NAME(m_prescaler));
|
|
save_item(NAME(m_STACK[0]));
|
|
save_item(NAME(m_STACK[1]));
|
|
save_item(NAME(m_PC));
|
|
save_item(NAME(m_PREVPC));
|
|
save_item(NAME(m_CONFIG));
|
|
save_item(NAME(m_opcode.d));
|
|
save_item(NAME(m_delay_timer));
|
|
save_item(NAME(m_picmodel));
|
|
save_item(NAME(m_reset_vector));
|
|
|
|
save_item(NAME(m_temp_config));
|
|
save_item(NAME(m_inst_cycles));
|
|
|
|
state_add( PIC16C5x_PC, "PC", m_PC).mask(0xfff).formatstr("%03X");
|
|
state_add( PIC16C5x_W, "W", m_W).formatstr("%02X");
|
|
state_add( PIC16C5x_ALU, "ALU", m_ALU).formatstr("%02X");
|
|
state_add( PIC16C5x_STR, "STR", m_debugger_temp).mask(0xff).callimport().callexport().formatstr("%02X");
|
|
state_add( PIC16C5x_TMR0, "TMR", m_debugger_temp).mask(0xff).callimport().callexport().formatstr("%02X");
|
|
state_add( PIC16C5x_WDT, "WDT", m_WDT).formatstr("%04X");
|
|
state_add( PIC16C5x_OPT, "OPT", m_OPTION).formatstr("%02X");
|
|
state_add( PIC16C5x_STK0, "STK0", m_STACK[0]).mask(0xfff).formatstr("%03X");
|
|
state_add( PIC16C5x_STK1, "STK1", m_STACK[1]).mask(0xfff).formatstr("%03X");
|
|
state_add( PIC16C5x_PRTA, "PRTA", m_debugger_temp).mask(0xf).callimport().callexport().formatstr("%01X");
|
|
state_add( PIC16C5x_PRTB, "PRTB", m_debugger_temp).mask(0xff).callimport().callexport().formatstr("%02X");
|
|
state_add( PIC16C5x_PRTC, "PRTC", m_debugger_temp).mask(0xff).callimport().callexport().formatstr("%02X");
|
|
state_add( PIC16C5x_TRSA, "TRSA", m_TRISA).mask(0xf).formatstr("%01X");
|
|
state_add( PIC16C5x_TRSB, "TRSB", m_TRISB).formatstr("%02X");
|
|
state_add( PIC16C5x_TRSC, "TRSC", m_TRISC).formatstr("%02X");
|
|
state_add( PIC16C5x_FSR, "FSR", m_debugger_temp).mask(0xff).callimport().callexport().formatstr("%02X");
|
|
state_add( PIC16C5x_PSCL, "PSCL", m_debugger_temp).callimport().formatstr("%3s");
|
|
|
|
state_add( STATE_GENPC, "GENPC", m_PC).noshow();
|
|
state_add( STATE_GENFLAGS, "GENFLAGS", m_OPTION).formatstr("%13s").noshow();
|
|
state_add( STATE_GENPCBASE, "PREVPC", m_PREVPC).noshow();
|
|
|
|
m_icountptr = &m_icount;
|
|
}
|
|
|
|
|
|
void pic16c5x_device::state_import(const device_state_entry &entry)
|
|
{
|
|
switch (entry.index())
|
|
{
|
|
case PIC16C5x_STR:
|
|
STATUS = m_debugger_temp;
|
|
break;
|
|
case PIC16C5x_TMR0:
|
|
TMR0 = m_debugger_temp;
|
|
break;
|
|
case PIC16C5x_PRTA:
|
|
PORTA = m_debugger_temp;
|
|
break;
|
|
case PIC16C5x_PRTB:
|
|
PORTB = m_debugger_temp;
|
|
break;
|
|
case PIC16C5x_PRTC:
|
|
PORTC = m_debugger_temp;
|
|
break;
|
|
case PIC16C5x_FSR:
|
|
FSR = ((m_debugger_temp & m_picRAMmask) | (UINT8)(~m_picRAMmask));
|
|
break;
|
|
case PIC16C5x_PSCL:
|
|
m_prescaler = m_debugger_temp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::state_export(const device_state_entry &entry)
|
|
{
|
|
switch (entry.index())
|
|
{
|
|
case PIC16C5x_STR:
|
|
m_debugger_temp = STATUS;
|
|
break;
|
|
case PIC16C5x_TMR0:
|
|
m_debugger_temp = TMR0;
|
|
break;
|
|
case PIC16C5x_PRTA:
|
|
m_debugger_temp = PORTA & 0x0f;
|
|
break;
|
|
case PIC16C5x_PRTB:
|
|
m_debugger_temp = PORTB;
|
|
break;
|
|
case PIC16C5x_PRTC:
|
|
m_debugger_temp = PORTC;
|
|
break;
|
|
case PIC16C5x_FSR:
|
|
m_debugger_temp = ((FSR) & m_picRAMmask) | (UINT8)(~m_picRAMmask);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void pic16c5x_device::state_string_export(const device_state_entry &entry, std::string &str) const
|
|
{
|
|
switch (entry.index())
|
|
{
|
|
case PIC16C5x_PSCL:
|
|
str = string_format("%c%02X", ((m_OPTION & 0x08) ? 'W' : 'T'), m_prescaler);
|
|
break;
|
|
|
|
case STATE_GENFLAGS:
|
|
str = string_format("%01x%c%c%c%c%c %c%c%c%03x",
|
|
(STATUS & 0xe0) >> 5,
|
|
STATUS & 0x10 ? '.':'O', /* WDT Overflow */
|
|
STATUS & 0x08 ? 'P':'D', /* Power/Down */
|
|
STATUS & 0x04 ? 'Z':'.', /* Zero */
|
|
STATUS & 0x02 ? 'c':'b', /* Nibble Carry/Borrow */
|
|
STATUS & 0x01 ? 'C':'B', /* Carry/Borrow */
|
|
|
|
m_OPTION & 0x20 ? 'C':'T', /* Counter/Timer */
|
|
m_OPTION & 0x10 ? 'N':'P', /* Negative/Positive */
|
|
m_OPTION & 0x08 ? 'W':'T', /* WatchDog/Timer */
|
|
m_OPTION & 0x08 ? (1<<(m_OPTION&7)) : (2<<(m_OPTION&7)) );
|
|
break;
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Reset registers to their initial values
|
|
****************************************************************************/
|
|
|
|
void pic16c5x_device::pic16c5x_reset_regs()
|
|
{
|
|
m_PC = m_reset_vector;
|
|
m_CONFIG = m_temp_config;
|
|
m_TRISA = 0xff;
|
|
m_TRISB = 0xff;
|
|
m_TRISC = 0xff;
|
|
m_OPTION = (T0CS_FLAG | T0SE_FLAG | PSA_FLAG | PS_REG);
|
|
PCL = 0xff;
|
|
FSR |= (UINT8)(~m_picRAMmask);
|
|
PORTA &= 0x0f;
|
|
m_prescaler = 0;
|
|
m_delay_timer = 0;
|
|
m_old_T0 = 0;
|
|
m_inst_cycles = 0;
|
|
}
|
|
|
|
void pic16c5x_device::pic16c5x_soft_reset()
|
|
{
|
|
SET(STATUS, (TO_FLAG | PD_FLAG | Z_FLAG | DC_FLAG | C_FLAG));
|
|
pic16c5x_reset_regs();
|
|
}
|
|
|
|
void pic16c5x_device::pic16c5x_set_config(UINT16 data)
|
|
{
|
|
logerror("Writing %04x to the PIC16C5x config register\n",data);
|
|
m_temp_config = data;
|
|
}
|
|
|
|
|
|
void pic16c5x_device::device_reset()
|
|
{
|
|
pic16c5x_reset_regs();
|
|
CLR(STATUS, PA_REG);
|
|
SET(STATUS, (TO_FLAG | PD_FLAG));
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
* WatchDog
|
|
****************************************************************************/
|
|
|
|
void pic16c5x_device::pic16c5x_update_watchdog(int counts)
|
|
{
|
|
/* WatchDog is set up to count 18,000 (0x464f hex) ticks to provide */
|
|
/* the timeout period of 0.018ms based on a 4MHz input clock. */
|
|
/* Note: the 4MHz clock should be divided by the PIC16C5x_CLOCK_DIVIDER */
|
|
/* which effectively makes the PIC run at 1MHz internally. */
|
|
|
|
/* If the current instruction is CLRWDT or SLEEP, don't update the WDT */
|
|
|
|
if ((m_opcode.w.l != 3) && (m_opcode.w.l != 4))
|
|
{
|
|
UINT16 old_WDT = m_WDT;
|
|
|
|
m_WDT -= counts;
|
|
|
|
if (m_WDT > 0x464f) {
|
|
m_WDT = 0x464f - (0xffff - m_WDT);
|
|
}
|
|
|
|
if (((old_WDT != 0) && (old_WDT < m_WDT)) || (m_WDT == 0))
|
|
{
|
|
if (PSA) {
|
|
m_prescaler++;
|
|
if (m_prescaler >= (1 << PS)) { /* Prescale values from 1 to 128 */
|
|
m_prescaler = 0;
|
|
CLR(STATUS, TO_FLAG);
|
|
pic16c5x_soft_reset();
|
|
}
|
|
}
|
|
else {
|
|
CLR(STATUS, TO_FLAG);
|
|
pic16c5x_soft_reset();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
* Update Timer
|
|
****************************************************************************/
|
|
|
|
void pic16c5x_device::pic16c5x_update_timer(int counts)
|
|
{
|
|
if (PSA == 0) {
|
|
m_prescaler += counts;
|
|
if (m_prescaler >= (2 << PS)) { /* Prescale values from 2 to 256 */
|
|
TMR0 += (m_prescaler / (2 << PS));
|
|
m_prescaler %= (2 << PS); /* Overflow prescaler */
|
|
}
|
|
}
|
|
else {
|
|
TMR0 += counts;
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
* Execute IPeriod. Return 0 if emulation should be stopped
|
|
****************************************************************************/
|
|
|
|
void pic16c5x_device::execute_run()
|
|
{
|
|
UINT8 T0_in;
|
|
|
|
update_internalram_ptr();
|
|
|
|
do
|
|
{
|
|
if (PD == 0) /* Sleep Mode */
|
|
{
|
|
m_inst_cycles = 1;
|
|
debugger_instruction_hook(this, m_PC);
|
|
if (WDTE) {
|
|
pic16c5x_update_watchdog(1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_PREVPC = m_PC;
|
|
|
|
debugger_instruction_hook(this, m_PC);
|
|
|
|
m_opcode.d = M_RDOP(m_PC);
|
|
m_PC++;
|
|
PCL++;
|
|
|
|
if ((m_opcode.w.l & 0xff0) != 0x000) { /* Do all opcodes except the 00? ones */
|
|
m_inst_cycles = s_opcode_main[((m_opcode.w.l >> 4) & 0xff)].cycles;
|
|
(this->*s_opcode_main[((m_opcode.w.l >> 4) & 0xff)].function)();
|
|
}
|
|
else { /* Opcode 0x00? has many opcodes in its minor nibble */
|
|
m_inst_cycles = s_opcode_00x[(m_opcode.b.l & 0x1f)].cycles;
|
|
(this->*s_opcode_00x[(m_opcode.b.l & 0x1f)].function)();
|
|
}
|
|
|
|
if (T0CS) { /* Count mode */
|
|
T0_in = m_read_t0() ? 1 : 0;
|
|
if (T0SE) { /* Count falling edge T0 input */
|
|
if (FALLING_EDGE_T0) {
|
|
pic16c5x_update_timer(1);
|
|
}
|
|
}
|
|
else { /* Count rising edge T0 input */
|
|
if (RISING_EDGE_T0) {
|
|
pic16c5x_update_timer(1);
|
|
}
|
|
}
|
|
m_old_T0 = T0_in;
|
|
}
|
|
else { /* Timer mode */
|
|
if (m_delay_timer) {
|
|
m_delay_timer--;
|
|
}
|
|
else {
|
|
pic16c5x_update_timer(m_inst_cycles);
|
|
}
|
|
}
|
|
if (WDTE) {
|
|
pic16c5x_update_watchdog(m_inst_cycles);
|
|
}
|
|
}
|
|
|
|
m_icount -= m_inst_cycles;
|
|
|
|
} while (m_icount > 0);
|
|
}
|