Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-20 23:42:22 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

ht1130: system clock is stopped when halted so don't enter the icount loop

Browse Source
This commit is contained in:
hap 2023-12-26 20:12:39 +01:00
parent 6222175a22
commit 2857d5251c
1 changed files with 16 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/devices/cpu/ht1130/ht1130.cpp
View File

@ -4,11 +4,12 @@
/*
TODO:
Interrupts (not used by brke23p2)
Sound (needs internal frequency ROM data?)
IO wake-up from HALT etc.
1 machine cycle (eg. a 1 byte opcode) takes 4 system clock cycles (from OSC pins).
The timer rate can be configured with a mask option (system clock / 2^n), n=0-13 (except 6 for some reason). So, timer rate can be faster or slower than machine cycle rate.
- Interrupts (not used by brke23p2)
- Sound (needs internal frequency ROM data?)
- IO wake-up from HALT etc.
- 1 machine cycle (eg. a 1 byte opcode) takes 4 system clock cycles (from OSC pins).
- The timer rate can be configured with a mask option (system clock / 2^n), n=0-13 (except 6 for some reason).
So, timer rate can be faster or slower than machine cycle rate.
*/
@ -441,7 +442,7 @@ void ht1130_device::do_op()
return;
}
case 0b00011111: // OR [R1R0],A : Logically OR data memory with accumulator
case 0b00011111: // OR [R1R0],A : Logical OR data memory with accumulator
{
const u8 data = getr1r0_data();
const u8 acc = getacc();
@ -1015,6 +1016,8 @@ void ht1130_device::do_op()
if (operand == 0b00111110) // this is a 'NOP' must HALT always be followed by NOP to work?
{
m_inhalt = 1;
if (m_icount > 0)
m_icount = 0;
}
else
{
@ -1033,18 +1036,17 @@ void ht1130_device::do_op()
void ht1130_device::execute_run()
{
if (m_inhalt)
{
m_icount = 0;
return;
}
while (m_icount > 0)
{
debugger_instruction_hook(m_pc);
if (!m_inhalt)
{
do_op();
}
else
{
m_icount--;
}
do_op();
if (m_timer & 0x100)
{