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-rw-r--r--src/devices/cpu/sm510/sm500.cpp242
1 files changed, 242 insertions, 0 deletions
diff --git a/src/devices/cpu/sm510/sm500.cpp b/src/devices/cpu/sm510/sm500.cpp
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+++ b/src/devices/cpu/sm510/sm500.cpp
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+// 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
+
+ } // big switch
+}
+
+bool sm500_device::op_argument()
+{
+ // LBL and prefix opcodes are 2 bytes
+ return m_op == 0x5e || m_op == 0x5f;
+}