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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
#ifndef MAME_MACHINE_TAITSJSEC_H
#define MAME_MACHINE_TAITSJSEC_H
#pragma once
#include "cpu/m6805/m68705.h"
DECLARE_DEVICE_TYPE(TAITO_SJ_SECURITY_MCU, taito_sj_security_mcu_device)
class taito_sj_security_mcu_device : public device_t
{
public:
enum class int_mode
{
NONE,
LATCH,
WRITE
};
void set_int_mode(int_mode mode) { m_int_mode = mode; }
auto m68read_cb() { return m_68read_cb.bind(); }
auto m68write_cb() { return m_68write_cb.bind(); }
auto m68intrq_cb() { return m_68intrq_cb.bind(); }
auto busrq_cb() { return m_busrq_cb.bind(); }
taito_sj_security_mcu_device(
machine_config const &mconfig,
char const *tag,
device_t *owner,
u32 clock);
// uses two consecutive addresses
u8 data_r(address_space &space, offs_t offset);
void data_w(offs_t offset, u8 data);
DECLARE_WRITE_LINE_MEMBER(busak_w);
DECLARE_WRITE_LINE_MEMBER(reset_w);
protected:
void device_start() override;
void device_reset() override;
void device_add_mconfig(machine_config &config) override;
u8 mcu_pa_r();
u8 mcu_pc_r();
void mcu_pa_w(u8 data);
void mcu_pb_w(u8 data);
private:
u8 const get_bus_val() const
{ return (BIT(~m_pb_val, 1) ? m_host_data : 0xffU) & m_pa_val & ((m_busak && BIT(~m_pb_val, 5)) ? m_read_data : 0xffU); }
TIMER_CALLBACK_MEMBER(do_mcu_read);
TIMER_CALLBACK_MEMBER(do_mcu_write);
TIMER_CALLBACK_MEMBER(do_host_write);
required_device<m68705p_device> m_mcu;
int_mode m_int_mode;
devcb_read8 m_68read_cb;
devcb_write8 m_68write_cb;
devcb_write_line m_68intrq_cb;
devcb_write_line m_busrq_cb;
// IC6/IC10 latch/count the low byte, IC14 buffers low byte, IC3 latches high byte
u16 m_addr;
// latched by IC9
u8 m_mcu_data;
// latched by IC13
u8 m_host_data;
// buffered by IC16
u8 m_read_data;
// IC7 pin 6, indicates CPU has accepted data from MCU
bool m_zaccept;
// IC7 pin 9, indicates CPU has sent data to MCU
bool m_zready;
// previous MCU port outputs for detecting edges
u8 m_pa_val, m_pb_val;
// input state
bool m_busak, m_reset;
};
#endif // MAME_MACHINE_TATISJSEC_H
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