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// license:BSD-3-Clause
// copyright-holders:Angelo Salese, David Haywood
/***************************************************************************
rtc9701.h
Serial rtc9701s.
***************************************************************************/
#ifndef MAME_MACHINE_RTC9701_H
#define MAME_MACHINE_RTC9701_H
#pragma once
#include "dirtc.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> rtc9701_device
class rtc9701_device : public device_t,
public device_nvram_interface,
public device_rtc_interface
{
public:
// construction/destruction
rtc9701_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 32'768);
// I/O operations
void write_bit(int state);
int read_bit();
void set_cs_line(int state);
void set_clock_line(int state);
TIMER_CALLBACK_MEMBER(timer_callback);
protected:
enum class state_t : u8
{
CMD_WAIT = 0,
RTC_READ,
RTC_WRITE,
EEPROM_READ,
EEPROM_WRITE,
AFTER_WRITE_ENABLE
};
struct regs_t
{
uint8_t sec, min, hour, day, wday, month, year;
};
// device-level overrides
virtual void device_validity_check(validity_checker &valid) const override;
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;
inline uint8_t rtc_read(uint8_t offset);
inline void rtc_write(uint8_t offset,uint8_t data);
// device_rtc_interface overrides
virtual bool rtc_feature_y2k() const override { return false; }
virtual bool rtc_feature_leap_year() const override { return true; }
virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
int m_latch;
int m_reset_line;
int m_clock_line;
state_t rtc_state;
int cmd_stream_pos;
int current_cmd;
int rtc9701_address_pos;
int rtc9701_current_address;
uint16_t rtc9701_current_data;
int rtc9701_data_pos;
uint16_t rtc9701_data[0x100];
regs_t m_rtc;
emu_timer *m_timer;
};
// device type definition
DECLARE_DEVICE_TYPE(RTC9701, rtc9701_device)
#endif // MAME_MACHINE_RTC9701_H
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