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Diffstat (limited to 'src/devices/cpu/sm510/sm500.cpp')
-rw-r--r-- | src/devices/cpu/sm510/sm500.cpp | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/src/devices/cpu/sm510/sm500.cpp b/src/devices/cpu/sm510/sm500.cpp new file mode 100644 index 00000000000..7050d99c30d --- /dev/null +++ b/src/devices/cpu/sm510/sm500.cpp @@ -0,0 +1,242 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/* + + Sharp SM500 MCU core implementation + + TODO: + - EXKSA, EXKFA opcodes + - unknown which O group is which W output, guessed for now (segments and H should be ok) + +*/ + +#include "emu.h" +#include "sm500.h" +#include "sm510d.h" + + +// MCU types +DEFINE_DEVICE_TYPE(SM500, sm500_device, "sm500", "Sharp SM500") // 1.2K ROM, 4x10x4 RAM, shift registers for LCD + + +// internal memory maps +void sm500_device::program_1_2k(address_map &map) +{ + map(0x000, 0x4bf).rom(); +} + +void sm500_device::data_4x10x4(address_map &map) +{ + map(0x00, 0x09).ram(); + map(0x10, 0x19).ram(); + map(0x20, 0x29).ram(); + map(0x30, 0x39).ram(); +} + + +// device definitions +sm500_device::sm500_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, int stack_levels, int o_pins, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data) : + sm510_base_device(mconfig, type, tag, owner, clock, stack_levels, prgwidth, program, datawidth, data), + m_o_pins(o_pins) +{ } + +sm500_device::sm500_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : + sm500_device(mconfig, SM500, tag, owner, clock, 1 /* stack levels */, 7 /* o group pins */, 11 /* prg width */, address_map_constructor(FUNC(sm500_device::program_1_2k), this), 6 /* data width */, address_map_constructor(FUNC(sm500_device::data_4x10x4), this)) +{ } + + +// disasm +std::unique_ptr<util::disasm_interface> sm500_device::create_disassembler() +{ + return std::make_unique<sm500_disassembler>(); +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void sm500_device::device_start() +{ + // common init (not everything is used though) + sm510_base_device::device_start(); + + // init/zerofill + memset(m_ox, 0, sizeof(m_ox)); + memset(m_o, 0, sizeof(m_o)); + m_mx = 0; + m_cb = 0; + m_s = 0; + m_rsub = false; + + // register for savestates + save_item(NAME(m_ox)); + save_item(NAME(m_o)); + save_item(NAME(m_mx)); + save_item(NAME(m_cb)); + save_item(NAME(m_s)); + save_item(NAME(m_rsub)); +} + + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void sm500_device::device_reset() +{ + // common reset + sm510_base_device::device_reset(); + + // SM500 specific + push_stack(); + op_idiv(); + m_gamma = 1; + m_cb = 0; + m_rsub = false; + m_r = 0xf; +} + + + +//------------------------------------------------- +// lcd driver +//------------------------------------------------- + +void sm500_device::lcd_update() +{ + // 2 rows + for (int h = 0; h < 2; h++) + { + for (int o = 0; o < m_o_pins; o++) + { + // 4 segments per group + u8 seg = h ? m_ox[o] : m_o[o]; + m_write_segs(o << 1 | h, (m_bp & 1) ? seg : 0); + } + } +} + + + +//------------------------------------------------- +// buzzer controller +//------------------------------------------------- + +void sm500_device::clock_melody() +{ + // R1 from divider or direct control, R2-R4 generic outputs + u8 mask = (m_r_mask_option == RMASK_DIRECT) ? 1 : (m_div >> m_r_mask_option & 1); + u8 out = (mask & ~m_r) | (~m_r & 0xe); + + // output to R pins + if (out != m_r_out) + { + m_write_r(out); + m_r_out = out; + } +} + + + +//------------------------------------------------- +// execute +//------------------------------------------------- + +void sm500_device::execute_one() +{ + switch (m_op & 0xf0) + { + case 0x20: op_lax(); break; + case 0x30: + if (m_op == 0x30) op_ats(); // ! + else op_adx(); + break; + case 0x40: op_lb(); break; + case 0x70: op_ssr(); break; + + case 0x80: case 0x90: case 0xa0: case 0xb0: + op_tr(); break; + case 0xc0: case 0xd0: case 0xe0: case 0xf0: + op_trs(); break; + + default: + switch (m_op & 0xfc) + { + case 0x04: op_rm(); break; + case 0x0c: op_sm(); break; + case 0x10: op_exc(); break; + case 0x14: op_exci(); break; + case 0x18: op_lda(); break; + case 0x1c: op_excd(); break; + case 0x54: op_tmi(); break; // TM + + default: + switch (m_op) + { + case 0x00: op_skip(); break; + case 0x01: op_atr(); break; + case 0x02: op_exksa(); break; + case 0x03: op_atbp(); break; + case 0x08: op_add(); break; + case 0x09: op_add11(); break; // ADDC + case 0x0a: op_coma(); break; + case 0x0b: op_exbla(); break; + + case 0x50: op_tal(); break; // TA + case 0x51: op_tb(); break; + case 0x52: op_tc(); break; + case 0x53: op_tam(); break; + case 0x58: op_tis(); break; // TG + case 0x59: op_ptw(); break; + case 0x5a: op_ta0(); break; + case 0x5b: op_tabl(); break; + case 0x5c: op_tw(); break; + case 0x5d: op_dtw(); break; + case 0x5f: op_lbl(); break; + + case 0x60: op_comcn(); break; + case 0x61: op_pdtw(); break; + case 0x62: op_wr(); break; + case 0x63: op_ws(); break; + case 0x64: op_incb(); break; + case 0x65: op_idiv(); break; + case 0x66: op_rc(); break; + case 0x67: op_sc(); break; + case 0x68: op_rmf(); break; + case 0x69: op_smf(); break; + case 0x6a: op_kta(); break; + case 0x6b: op_exkfa(); break; + case 0x6c: op_decb(); break; + case 0x6d: op_comcb(); break; + case 0x6e: op_rtn0(); break; // RTN + case 0x6f: op_rtn1(); break; // RTNS + + // extended opcodes + case 0x5e: + m_op = m_op << 8 | m_param; + switch (m_param) + { + case 0x00: op_cend(); break; + case 0x04: op_dta(); break; + + default: op_illegal(); break; + } + break; // 0x5e + + default: op_illegal(); break; + } + break; // 0xff + + } + break; // 0xfc + + } // 0xf0 +} + +bool sm500_device::op_argument() +{ + // LBL and prefix opcodes are 2 bytes + return m_op == 0x5e || m_op == 0x5f; +} |