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Diffstat (limited to 'src/devices/cpu/tms1000/tms1k_base.cpp')
-rw-r--r--src/devices/cpu/tms1000/tms1k_base.cpp100
1 files changed, 88 insertions, 12 deletions
diff --git a/src/devices/cpu/tms1000/tms1k_base.cpp b/src/devices/cpu/tms1000/tms1k_base.cpp
index 985784570e8..bfbf6eab8af 100644
--- a/src/devices/cpu/tms1000/tms1k_base.cpp
+++ b/src/devices/cpu/tms1000/tms1k_base.cpp
@@ -5,8 +5,7 @@
TMS1000 family - base/shared
TODO:
- - fix debugger disasm view
- - INIT pin
+ - accurate INIT pin (currently, just use INPUT_LINE_RESET)
The TMS0980 and TMS1000-family MCU cores are very similar. The TMS0980 has a
@@ -72,7 +71,7 @@ unknown cycle: CME, SSE, SSS
tms1k_base_device::tms1k_base_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u8 o_pins, u8 r_pins, u8 pc_bits, u8 byte_bits, u8 x_bits, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data)
: cpu_device(mconfig, type, tag, owner, clock)
- , m_program_config("program", ENDIANNESS_BIG, byte_bits > 8 ? 16 : 8, prgwidth, 0, program)
+ , m_program_config("program", ENDIANNESS_BIG, byte_bits > 8 ? 16 : 8, prgwidth, byte_bits > 8 ? -1 : 0, program)
, m_data_config("data", ENDIANNESS_BIG, 8, datawidth, 0, data)
, m_mpla(*this, "mpla")
, m_ipla(*this, "ipla")
@@ -145,6 +144,7 @@ void tms1k_base_device::device_start()
m_r = 0;
m_o = 0;
m_o_index = 0;
+ m_halt = false;
m_cki_bus = 0;
m_c4 = 0;
m_p = 0;
@@ -184,6 +184,7 @@ void tms1k_base_device::device_start()
save_item(NAME(m_r));
save_item(NAME(m_o));
save_item(NAME(m_o_index));
+ save_item(NAME(m_halt));
save_item(NAME(m_cki_bus));
save_item(NAME(m_c4));
save_item(NAME(m_p));
@@ -225,6 +226,14 @@ void tms1k_base_device::device_start()
m_icountptr = &m_icount;
}
+device_memory_interface::space_config_vector tms1k_base_device::memory_space_config() const
+{
+ return space_config_vector {
+ std::make_pair(AS_PROGRAM, &m_program_config),
+ std::make_pair(AS_DATA, &m_data_config)
+ };
+}
+
//-------------------------------------------------
@@ -260,13 +269,6 @@ void tms1k_base_device::device_reset()
m_power_off(0);
}
-device_memory_interface::space_config_vector tms1k_base_device::memory_space_config() const
-{
- return space_config_vector {
- std::make_pair(AS_PROGRAM, &m_program_config),
- std::make_pair(AS_DATA, &m_data_config)
- };
-}
//-------------------------------------------------
@@ -306,6 +308,15 @@ void tms1k_base_device::read_opcode()
// i/o handling
//-------------------------------------------------
+void tms1k_base_device::execute_set_input(int line, int state)
+{
+ if (line != TMS1XXX_INPUT_LINE_HALT)
+ return;
+
+ // HALT pin (CMOS only)
+ m_halt = bool(state);
+}
+
void tms1k_base_device::write_o_output(u8 index)
{
// a hardcoded table is supported if the output pla is unknown
@@ -405,6 +416,62 @@ void tms1k_base_device::op_retn()
}
+// TMS1400/TMS1000C 3-level stack version
+
+void tms1k_base_device::op_br3()
+{
+ // BR/BL: conditional branch
+ if (m_status)
+ {
+ m_pa = m_pb; // don't care about clatch
+ m_ca = m_cb;
+ m_pc = m_opcode & m_pc_mask;
+ }
+}
+
+void tms1k_base_device::op_call3()
+{
+ // CALL/CALLL: conditional call
+ if (m_status)
+ {
+ // mask clatch 3 bits (no need to mask others)
+ m_clatch = (m_clatch << 1 | 1) & 7;
+
+ m_sr = m_sr << m_pc_bits | m_pc;
+ m_pc = m_opcode & m_pc_mask;
+
+ m_ps = m_ps << 4 | m_pa;
+ m_pa = m_pb;
+
+ m_cs = m_cs << 2 | m_ca;
+ m_ca = m_cb;
+ }
+ else
+ {
+ m_pb = m_pa;
+ m_cb = m_ca;
+ }
+}
+
+void tms1k_base_device::op_retn3()
+{
+ // RETN: return from subroutine
+ if (m_clatch & 1)
+ {
+ m_clatch >>= 1;
+
+ m_pc = m_sr & m_pc_mask;
+ m_sr >>= m_pc_bits;
+
+ m_pa = m_pb = m_ps & 0xf;
+ m_ps >>= 4;
+
+ m_ca = m_cb = m_cs & 3;
+ m_cs >>= 2;
+ }
+}
+
+
// handle other:
// TMS1000/common
@@ -542,9 +609,17 @@ void tms1k_base_device::op_sbl()
void tms1k_base_device::execute_run()
{
- do
+ while (m_icount > 0)
{
m_icount--;
+
+ if (m_halt)
+ {
+ // not running (output pins remain unchanged)
+ m_icount = 0;
+ return;
+ }
+
switch (m_subcycle)
{
case 0:
@@ -667,6 +742,7 @@ void tms1k_base_device::execute_run()
// execute: br/call 1/2
break;
}
+
m_subcycle = (m_subcycle + 1) % 6;
- } while (m_icount > 0);
+ }
}