diff options
Diffstat (limited to 'src/devices/cpu/rw5000/a5000.cpp')
-rw-r--r-- | src/devices/cpu/rw5000/a5000.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/devices/cpu/rw5000/a5000.cpp b/src/devices/cpu/rw5000/a5000.cpp new file mode 100644 index 00000000000..bb39455cc18 --- /dev/null +++ b/src/devices/cpu/rw5000/a5000.cpp @@ -0,0 +1,86 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/* + + Rockwell A5000 MCU + +*/ + +#include "emu.h" +#include "a5000.h" + +#include "rw5000d.h" + + +DEFINE_DEVICE_TYPE(A5000, a5000_cpu_device, "a5000", "Rockwell A5000") + + +// constructor +a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data) : + b5000_cpu_device(mconfig, type, tag, owner, clock, prgwidth, program, datawidth, data) +{ } + +a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : + a5000_cpu_device(mconfig, A5000, tag, owner, clock, 9, address_map_constructor(FUNC(a5000_cpu_device::program_448x8), this), 6, address_map_constructor(FUNC(a5000_cpu_device::data_45x4), this)) +{ } + + +// disasm +std::unique_ptr<util::disasm_interface> a5000_cpu_device::create_disassembler() +{ + return std::make_unique<a5000_disassembler>(); +} + + +//------------------------------------------------- +// execute +//------------------------------------------------- + +void a5000_cpu_device::execute_one() +{ + switch (m_op) + { + case 0x02: op_illegal(); break; + case 0x03: op_tkb(); break; + case 0x76: m_mtd_step = 1; break; + case 0x77: op_atb(); break; + + // rest is same as B5000 + default: b5000_cpu_device::execute_one(); break; + } +} + + +//------------------------------------------------- +// changed opcodes (no need for separate file) +//------------------------------------------------- + +void a5000_cpu_device::op_mtd_step() +{ + assert(m_mtd_step > 0); + + // MTD: load strobe + segments (multi step) + switch (m_mtd_step) + { + // step 1: disable strobe and segment drivers + case 1: + m_write_str(0); + op_kseg(); + break; + + // step 2: load strobe from Bl + case 2: + m_write_str(1 << m_prev_bl); + break; + + // step 4: load segment drivers + case 4: + seg_w(m_seg | decode_digit(m_prev3_c << 4 | ram_r())); + m_mtd_step = 0; + return; + + default: + break; + } + m_mtd_step++; +} |