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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Motorola MCCS1850 Serial Real-Time Clock emulation
**********************************************************************
_____ _____
Vbat 1 |* \_/ | 16 Vdd
_POR 2 | | 15 TEST
_INT 3 | | 14 XTAL1
SCK 4 | MCCS1850 | 13 XTAL2
SDI 5 | | 12 _PWRSW
SDO 6 | | 11 NUC
CE 7 | | 10 _PSE
Vss 8 |_____________| 9 PSE
**********************************************************************/
#ifndef MAME_MACHINE_MCCS1850_H
#define MAME_MACHINE_MCCS1850_H
#pragma once
#include "dirtc.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> mccs1850_device
class mccs1850_device : public device_t,
public device_rtc_interface,
public device_nvram_interface
{
public:
// construction/destruction
mccs1850_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
auto int_wr_callback() { return int_cb.bind(); }
auto pse_wr_callback() { return pse_cb.bind(); }
auto nuc_wr_callback() { return nuc_cb.bind(); }
void ce_w(int state);
void sck_w(int state);
int sdo_r();
void sdi_w(int state);
void pwrsw_w(int state);
void por_w(int state);
void test_w(int state);
protected:
// device-level overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
// device_rtc_interface overrides
virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
private:
void check_interrupt();
void set_pse_line(bool state);
uint8_t read_register(offs_t offset);
void write_register(offs_t offset, uint8_t data);
TIMER_CALLBACK_MEMBER(advance_seconds);
devcb_write_line int_cb, pse_cb, nuc_cb;
uint8_t m_ram[0x80]; // RAM
// power supply
int m_pse; // power supply enable
// counter
uint32_t m_counter; // seconds counter
// serial interface
int m_ce; // chip enable
int m_sck; // serial clock
int m_sdo; // serial data out
int m_sdi; // serial data in
int m_state; // serial interface state
uint8_t m_address; // address counter
int m_bits; // bit counter
uint8_t m_shift; // shift register
// timers
emu_timer *m_clock_timer;
};
// device type definition
DECLARE_DEVICE_TYPE(MCCS1850, mccs1850_device)
#endif // MAME_MACHINE_MCCS1850_H
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