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upd7810: Refresh PA/PB/PC/PF outputs upon mode change

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cz101: Switch to bitbanged HD44780 interface (nw)
This commit is contained in:
AJR 2020-03-12 11:18:03 -04:00
parent c00a334c30
commit c152da7955
2 changed files with 18 additions and 22 deletions
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12
src/devices/cpu/upd7810/upd7810_opcodes.cpp
View File

@ -1047,25 +1047,37 @@ void upd7810_device::MOV_MCC_A()
/* 4d d2: 0100 1101 1101 0010 */
void upd7810_device::MOV_MA_A()
{
if (MA == A)
return;
MA = A;
WP(UPD7810_PORTA, m_pa_out);
}
/* 4d d3: 0100 1101 1101 0011 */
void upd7810_device::MOV_MB_A()
{
if (MB == A)
return;
MB = A;
WP(UPD7810_PORTB, m_pb_out);
}
/* 4d d4: 0100 1101 1101 0100 */
void upd7810_device::MOV_MC_A()
{
if (MC == A)
return;
MC = A;
WP(UPD7810_PORTC, m_pc_out);
}
/* 4d d7: 0100 1101 1101 0111 */
void upd7810_device::MOV_MF_A()
{
if (MF == A)
return;
MF = A;
WP(UPD7810_PORTF, m_pf_out);
}
/* 4d d8: 0100 1101 1101 1000 */

28
src/mame/drivers/cz101.cpp
View File

@ -7,8 +7,6 @@
Digital Synthesizer
TODO:
- To get the display to show something, our uPD7810 core needs to
output the full port value even if the port is set as input (port a).
- Currently seems to hang while processing the serial ports (midi). Our
uPD7810 core is lacking the externally clocked serial mode.
@ -59,8 +57,6 @@ private:
void maincpu_map(address_map &map);
DECLARE_READ8_MEMBER(port_a_r);
DECLARE_WRITE8_MEMBER(port_a_w);
DECLARE_WRITE8_MEMBER(port_b_w);
DECLARE_READ8_MEMBER(port_c_r);
DECLARE_WRITE8_MEMBER(port_c_w);
@ -320,22 +316,6 @@ READ8_MEMBER( cz101_state::keys_r )
return m_keys[m_port_b & 0x0f]->read();
}
// 76543210 lcd data bus
READ8_MEMBER( cz101_state::port_a_r )
{
if ((BIT(m_port_c, 7) == 1) && (BIT(m_port_c, 6) == 1))
return m_hd44780->read(BIT(m_port_c, 5));
return 0xff;
}
WRITE8_MEMBER( cz101_state::port_a_w )
{
if ((BIT(m_port_c, 7) == 1) && (BIT(m_port_c, 6) == 0))
m_hd44780->write(BIT(m_port_c, 5), data);
}
// 7------- nmi output
// -6------ music lsi write enable
// --5----- music lsi chip select
@ -363,6 +343,9 @@ WRITE8_MEMBER( cz101_state::port_c_w )
LOG("port_c_w: %02x\n", data);
m_port_c = data;
m_hd44780->e_w(!BIT(data, 7));
m_hd44780->rw_w(BIT(data, 6));
m_hd44780->rs_w(BIT(data, 5));
}
void cz101_state::machine_start()
@ -385,10 +368,11 @@ void cz101_state::cz101(machine_config &config)
{
UPD7810(config, m_maincpu, 10_MHz_XTAL); // actually 7811, but internal ROM disabled
m_maincpu->set_addrmap(AS_PROGRAM, &cz101_state::maincpu_map);
m_maincpu->pa_in_cb().set(FUNC(cz101_state::port_a_r));
m_maincpu->pa_out_cb().set(FUNC(cz101_state::port_a_w));
m_maincpu->pa_in_cb().set(m_hd44780, FUNC(hd44780_device::db_r));
m_maincpu->pa_out_cb().set(m_hd44780, FUNC(hd44780_device::db_w));
m_maincpu->pb_out_cb().set(FUNC(cz101_state::port_b_w));
m_maincpu->pc_out_cb().set(FUNC(cz101_state::port_c_w));
m_maincpu->set_pc_pullups(0x03);
CLOCK(config, "midi_clock", 2_MHz_XTAL)/*.signal_handler().set(m_maincpu, FUNC(upd7810_device::sck_w))*/; // not supported yet