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-rw-r--r--src/devices/cpu/m6502/m5074x.cpp507
1 files changed, 507 insertions, 0 deletions
diff --git a/src/devices/cpu/m6502/m5074x.cpp b/src/devices/cpu/m6502/m5074x.cpp
new file mode 100644
index 00000000000..dc499b912c0
--- /dev/null
+++ b/src/devices/cpu/m6502/m5074x.cpp
@@ -0,0 +1,507 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont, Olivier Galibert
+/*
+ Mitsubishi M5074x 8-bit microcontroller family
+*/
+
+#include "emu.h"
+#include "m5074x.h"
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define IRQ_CNTRREQ (0x80)
+#define IRQ_CNTRENA (0x40)
+#define IRQ_TMR1REQ (0x20)
+#define IRQ_TMR1ENA (0x10)
+#define IRQ_TMR2REQ (0x08)
+#define IRQ_TMR2ENA (0x04)
+#define IRQ_INTREQ (0x02)
+#define IRQ_INTENA (0x01)
+
+#define TMRC_TMRXREQ (0x80)
+#define TMRC_TMRXENA (0x40)
+#define TMRC_TMRXHLT (0x20)
+#define TMRC_TMRXMDE (0x0c)
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type M50740 = &device_creator<m50740_device>;
+const device_type M50741 = &device_creator<m50741_device>;
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// m5074x_device - constructor
+//-------------------------------------------------
+m5074x_device::m5074x_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, address_map_constructor internal_map, const char *shortname, const char *source) :
+ m740_device(mconfig, type, name, tag, owner, clock, shortname, source),
+ m_program_config("program", ENDIANNESS_LITTLE, 8, 13, 0, internal_map),
+ read_p0(*this),
+ read_p1(*this),
+ read_p2(*this),
+ read_p3(*this),
+ write_p0(*this),
+ write_p1(*this),
+ write_p2(*this),
+ write_p3(*this)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void m5074x_device::device_start()
+{
+ read_p0.resolve_safe(0);
+ read_p1.resolve_safe(0);
+ read_p2.resolve_safe(0);
+ read_p3.resolve_safe(0);
+ write_p0.resolve_safe();
+ write_p1.resolve_safe();
+ write_p2.resolve_safe();
+ write_p3.resolve_safe();
+
+ for (int i = 0; i < NUM_TIMERS; i++)
+ {
+ m_timers[i] = timer_alloc(i, NULL);
+ }
+
+ m740_device::device_start();
+
+ save_item(NAME(m_ports));
+ save_item(NAME(m_ddrs));
+ save_item(NAME(m_intctrl));
+ save_item(NAME(m_tmrctrl));
+ save_item(NAME(m_tmr12pre));
+ save_item(NAME(m_tmr1));
+ save_item(NAME(m_tmr2));
+ save_item(NAME(m_tmrxpre));
+ save_item(NAME(m_tmrx));
+ save_item(NAME(m_tmr1latch));
+ save_item(NAME(m_tmr2latch));
+ save_item(NAME(m_tmrxlatch));
+ save_item(NAME(m_last_all_ints));
+
+ memset(m_ports, 0, sizeof(m_ports));
+ memset(m_ddrs, 0, sizeof(m_ddrs));
+ m_intctrl = m_tmrctrl = 0;
+ m_tmr12pre = m_tmrxpre = 0;
+ m_tmr1 = m_tmr2 = m_tmrx = 0;
+ m_last_all_ints = 0;
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void m5074x_device::device_reset()
+{
+ m740_device::device_reset();
+
+ // all ports reset to input on startup
+ memset(m_ports, 0, sizeof(m_ports));
+ memset(m_ddrs, 0, sizeof(m_ddrs));
+ m_intctrl = m_tmrctrl = 0;
+ m_tmr12pre = m_tmrxpre = 0;
+ m_tmr1 = m_tmr2 = m_tmrx = 0;
+}
+
+void m5074x_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ switch (id)
+ {
+ case TIMER_1:
+ m_tmr1--;
+
+ if (m_tmr1 <= 0)
+ {
+ m_intctrl |= IRQ_TMR1REQ;
+ m_tmr1 = m_tmr1latch;
+ recalc_irqs();
+ }
+ break;
+
+ case TIMER_2:
+ m_tmr2--;
+
+ if (m_tmr2 <= 0)
+ {
+ m_intctrl |= IRQ_TMR2REQ;
+ m_tmr2 = m_tmr2latch;
+ recalc_irqs();
+ }
+ break;
+
+ case TIMER_X:
+ m_tmrx--;
+
+ if (m_tmrx <= 0)
+ {
+ m_tmrctrl |= TMRC_TMRXREQ;
+ m_tmrx = m_tmrxlatch;
+ recalc_irqs();
+ }
+ break;
+ }
+}
+
+void m5074x_device::execute_set_input(int inputnum, int state)
+{
+ switch (inputnum)
+ {
+ case M5074X_INT1_LINE:
+ if (state == ASSERT_LINE)
+ {
+ m_intctrl |= IRQ_INTREQ;
+ }
+ else
+ {
+ m_intctrl &= ~IRQ_INTREQ;
+ }
+ break;
+
+ case M5074X_SET_OVERFLOW: // the base 740 class can handle this
+ m740_device::execute_set_input(M740_SET_OVERFLOW, state);
+ break;
+ }
+
+ recalc_irqs();
+}
+
+void m5074x_device::recalc_irqs()
+{
+ UINT8 all_ints = 0;
+
+ if ((m_intctrl & (IRQ_CNTRREQ|IRQ_CNTRENA)) == (IRQ_CNTRREQ|IRQ_CNTRENA))
+ {
+ all_ints |= 0x01;
+ }
+ if ((m_tmrctrl & (TMRC_TMRXREQ|TMRC_TMRXENA)) == (TMRC_TMRXREQ|TMRC_TMRXENA))
+ {
+ all_ints |= 0x02;
+ }
+ if ((m_intctrl & (IRQ_TMR1REQ|IRQ_TMR1ENA)) == (IRQ_TMR1REQ|IRQ_TMR1ENA))
+ {
+ all_ints |= 0x04;
+ }
+ if ((m_intctrl & (IRQ_TMR2REQ|IRQ_TMR2ENA)) == (IRQ_TMR2REQ|IRQ_TMR2ENA))
+ {
+ all_ints |= 0x08;
+ }
+ if ((m_intctrl & (IRQ_INTREQ|IRQ_INTENA)) == (IRQ_INTREQ|IRQ_INTENA))
+ {
+ all_ints |= 0x10;
+ }
+
+ // check all 5 IRQ bits for changes
+ for (int i = 0; i < 5; i++)
+ {
+ // if bit is set now
+ if (all_ints & (1 << i))
+ {
+ // and wasn't last time
+ if (!(m_last_all_ints & (1 << i)))
+ {
+ m740_device::execute_set_input(M740_INT0_LINE + i, ASSERT_LINE);
+ }
+ }
+ else // bit is clear now
+ {
+ // ...and wasn't clear last time
+ if (m_last_all_ints & (1 << i))
+ {
+ m740_device::execute_set_input(M740_INT0_LINE + i, CLEAR_LINE);
+ }
+ }
+ }
+
+ m_last_all_ints = all_ints;
+}
+
+void m5074x_device::recalc_timer(int timer)
+{
+ int hz;
+
+ switch (timer)
+ {
+ case 0:
+ hz = clock() / 16;
+ hz /= (m_tmr12pre + 2);
+ m_timers[TIMER_1]->adjust(attotime::from_hz(hz), 0, attotime::from_hz(hz));
+ break;
+
+ case 1:
+ hz = clock() / 16;
+ hz /= (m_tmr12pre + 2);
+ m_timers[TIMER_2]->adjust(attotime::from_hz(hz), 0, attotime::from_hz(hz));
+ break;
+
+ case 2:
+ // Timer X modes: 00 = free run countdown, 01 = invert CNTR pin each time expires,
+ // 10 = count each time CNTR pin inverts, 11 = count when CNTR pin low
+ if ((m_tmrctrl & TMRC_TMRXMDE) == 0)
+ {
+ // stop bit?
+ if (m_tmrctrl & TMRC_TMRXHLT)
+ {
+ m_timers[TIMER_X]->adjust(attotime::never, 0, attotime::never);
+ }
+ else
+ {
+ hz = clock() / 16;
+ hz /= (m_tmrxpre + 2);
+ m_timers[TIMER_X]->adjust(attotime::from_hz(hz), 0, attotime::from_hz(hz));
+ }
+ }
+ else
+ {
+ fatalerror("M5074x: Unhandled timer X mode %d\n", (m_tmrctrl&TMRC_TMRXMDE)>>2);
+ }
+ break;
+ }
+}
+
+void m5074x_device::send_port(address_space &space, UINT8 offset, UINT8 data)
+{
+ switch (offset)
+ {
+ case 0:
+ write_p0(data);
+ break;
+
+ case 1:
+ write_p1(data);
+ break;
+
+ case 2:
+ write_p2(data);
+ break;
+
+ case 3:
+ write_p3(data);
+ break;
+ }
+}
+
+UINT8 m5074x_device::read_port(UINT8 offset)
+{
+ UINT8 incoming = 0;
+
+ switch (offset)
+ {
+ case 0:
+ incoming = read_p0();
+ break;
+
+ case 1:
+ incoming = read_p1();
+ break;
+
+ case 2:
+ incoming = read_p2();
+ break;
+
+ case 3:
+ incoming = read_p3();
+ break;
+ }
+
+ // apply data direction registers
+ incoming &= (m_ddrs[offset] ^ 0xff);
+ // OR in ddr-masked version of port writes
+ incoming |= (m_ports[offset] & m_ddrs[offset]);
+
+ return incoming;
+}
+
+READ8_MEMBER(m5074x_device::ports_r)
+{
+ switch (offset)
+ {
+ case 0:
+ return read_port(0);
+
+ case 1:
+ return m_ddrs[0];
+
+ case 2:
+ return read_port(1);
+
+ case 3:
+ return m_ddrs[1];
+
+ case 4:
+ return read_port(2);
+
+ case 5:
+ return m_ddrs[2];
+
+ case 8:
+ return read_port(3);
+
+ case 9:
+ return m_ddrs[3];
+ }
+
+ return 0xff;
+}
+
+WRITE8_MEMBER(m5074x_device::ports_w)
+{
+ switch (offset)
+ {
+ case 0: // p0
+ send_port(space, 0, data & m_ddrs[0]);
+ m_ports[0] = data;
+ break;
+
+ case 1: // p0 ddr
+ send_port(space, 0, m_ports[0] & data);
+ m_ddrs[0] = data;
+ break;
+
+ case 2: // p1
+ send_port(space, 1, data & m_ddrs[1]);
+ m_ports[1] = data;
+ break;
+
+ case 3: // p1 ddr
+ send_port(space, 1, m_ports[1] & data);
+ m_ddrs[1] = data;
+ break;
+
+ case 4: // p2
+ send_port(space, 2, data & m_ddrs[2]);
+ m_ports[2] = data;
+ break;
+
+ case 5: // p2 ddr
+ send_port(space, 2, m_ports[2] & data);
+ m_ddrs[2] = data;
+ break;
+
+ case 8: // p3
+ send_port(space, 3, data & m_ddrs[3]);
+ m_ports[3] = data;
+ break;
+
+ case 9: // p3 ddr
+ send_port(space, 3, m_ports[3] & data);
+ m_ddrs[3] = data;
+ break;
+ }
+}
+
+READ8_MEMBER(m5074x_device::tmrirq_r)
+{
+ switch (offset)
+ {
+ case 0:
+ return m_tmr12pre;
+
+ case 1:
+ return m_tmr1;
+
+ case 2:
+ return m_tmr2;
+
+ case 3:
+ return m_tmrxpre;
+
+ case 4:
+ return m_tmrx;
+
+ case 5:
+ return m_intctrl;
+
+ case 6:
+ return m_tmrctrl;
+ }
+
+ return 0xff;
+}
+
+WRITE8_MEMBER(m5074x_device::tmrirq_w)
+{
+// printf("%02x to tmrirq @ %d\n", data, offset);
+
+ switch (offset)
+ {
+ case 0:
+ m_tmr12pre = data;
+ recalc_timer(0);
+ recalc_timer(1);
+ break;
+
+ case 1:
+ m_tmr1 = m_tmr1latch = data;
+ break;
+
+ case 2:
+ m_tmr2 = m_tmr2latch = data;
+ break;
+
+ case 3:
+ m_tmrxpre = m_tmrxlatch = data;
+ recalc_timer(2);
+ break;
+
+ case 4:
+ m_tmrx = data;
+ break;
+
+ case 5:
+ m_intctrl = data;
+ recalc_irqs();
+ break;
+
+ case 6:
+ m_tmrctrl = data;
+ recalc_irqs();
+ break;
+ }
+}
+
+/* M50740 - baseline for this familiy */
+static ADDRESS_MAP_START( m50740_map, AS_PROGRAM, 8, m50740_device )
+ AM_RANGE(0x0000, 0x005f) AM_RAM
+ AM_RANGE(0x00e0, 0x00e9) AM_READWRITE(ports_r, ports_w)
+ AM_RANGE(0x00f9, 0x00ff) AM_READWRITE(tmrirq_r, tmrirq_w)
+ AM_RANGE(0x1400, 0x1fff) AM_ROM AM_REGION(M5074X_INTERNAL_ROM_REGION, 0)
+ADDRESS_MAP_END
+
+m50740_device::m50740_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ m5074x_device(mconfig, M50740, "Mitsubishi M50740", tag, owner, clock, ADDRESS_MAP_NAME(m50740_map), "m50740", __FILE__)
+{
+}
+
+m50740_device::m50740_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
+ m5074x_device(mconfig, type, name, tag, owner, clock, ADDRESS_MAP_NAME(m50740_map), shortname, source)
+{
+}
+
+/* M50741 - 50740 with a larger internal ROM */
+static ADDRESS_MAP_START( m50741_map, AS_PROGRAM, 8, m50741_device )
+ AM_RANGE(0x0000, 0x005f) AM_RAM
+ AM_RANGE(0x00e0, 0x00e9) AM_READWRITE(ports_r, ports_w)
+ AM_RANGE(0x00f9, 0x00ff) AM_READWRITE(tmrirq_r, tmrirq_w)
+ AM_RANGE(0x1000, 0x1fff) AM_ROM AM_REGION("internal", 0)
+ADDRESS_MAP_END
+
+m50741_device::m50741_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ m5074x_device(mconfig, M50740, "Mitsubishi M50741", tag, owner, clock, ADDRESS_MAP_NAME(m50741_map), "m50741", __FILE__)
+{
+}
+
+m50741_device::m50741_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
+ m5074x_device(mconfig, type, name, tag, owner, clock, ADDRESS_MAP_NAME(m50741_map), shortname, source)
+{
+}