diff options
Diffstat (limited to 'src/devices/cpu/rw5000/a5500.cpp')
-rw-r--r-- | src/devices/cpu/rw5000/a5500.cpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/devices/cpu/rw5000/a5500.cpp b/src/devices/cpu/rw5000/a5500.cpp new file mode 100644 index 00000000000..1e228e2a8fb --- /dev/null +++ b/src/devices/cpu/rw5000/a5500.cpp @@ -0,0 +1,79 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/* + + Rockwell A5500 MCU + +*/ + +#include "emu.h" +#include "a5500.h" + +#include "rw5000d.h" + + +DEFINE_DEVICE_TYPE(A5500, a5500_cpu_device, "a5500", "Rockwell A5500") + + +// constructor +a5500_cpu_device::a5500_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) : + a5000_cpu_device(mconfig, type, tag, owner, clock, prgwidth, program, datawidth, data) +{ } + +a5500_cpu_device::a5500_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : + a5500_cpu_device(mconfig, A5500, tag, owner, clock, 10, address_map_constructor(FUNC(a5500_cpu_device::program_768x8), this), 6, address_map_constructor(FUNC(a5500_cpu_device::data_48x4), this)) +{ } + + +// internal memory maps +void a5500_cpu_device::program_768x8(address_map &map) +{ + map(0x000, 0x27f).rom(); + map(0x380, 0x3ff).rom(); +} + +void a5500_cpu_device::data_48x4(address_map &map) +{ + map(0x00, 0x0b).ram(); + map(0x10, 0x1b).ram(); + map(0x20, 0x2b).ram(); + map(0x30, 0x3b).ram(); +} + + +// disasm +std::unique_ptr<util::disasm_interface> a5500_cpu_device::create_disassembler() +{ + return std::make_unique<a5500_disassembler>(); +} + + +//------------------------------------------------- +// execute +//------------------------------------------------- + +void a5500_cpu_device::execute_one() +{ + switch (m_op) + { + case 0x1c: case 0x1d: case 0x1e: case 0x1f: op_lb(11); break; + case 0x38: case 0x39: case 0x3a: case 0x3b: op_tl(); break; + + case 0x0c: op_sc(); break; + case 0x0d: op_rsc(); break; + case 0x6f: b5000_cpu_device::op_read(); break; + + // rest is same as A5000 + default: a5000_cpu_device::execute_one(); break; + } +} + +bool a5500_cpu_device::op_is_tl(u8 op) +{ + return ((op & 0xf8) == 0x30) || ((op & 0xfc) == 0x38); +} + +bool a5500_cpu_device::op_is_lb(u8 op) +{ + return ((op & 0xfc) == 0x1c) || ((op & 0xf0) == 0x20) || ((op & 0xfc) == 0x3c); +} |