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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Dallas DS1302 Trickle-Charge Timekeeping Chip emulation
**********************************************************************
_____ _____
Vcc2 1 |* \_/ | 8 Vcc1
X1 2 | | 7 SCLK
X2 3 | | 6 I/O
GND 4 |_____________| 5 CE
**********************************************************************/
#ifndef MAME_MACHINE_DS1302_H
#define MAME_MACHINE_DS1302_H
#pragma once
#include "dirtc.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_DS1302_ADD(_tag, _clock) \
MCFG_DEVICE_ADD(_tag, DS1302, _clock)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ds1302_device
class ds1302_device : public device_t,
public device_rtc_interface,
public device_nvram_interface
{
public:
// construction/destruction
ds1302_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
DECLARE_WRITE_LINE_MEMBER( ce_w );
DECLARE_WRITE_LINE_MEMBER( sclk_w );
DECLARE_WRITE_LINE_MEMBER( io_w );
DECLARE_READ_LINE_MEMBER( io_r );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual void nvram_read(emu_file &file) override;
virtual void nvram_write(emu_file &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;
virtual bool rtc_feature_leap_year() const override { return true; }
private:
void load_shift_register();
void input_bit();
void output_bit();
int m_ce;
int m_clk;
int m_io;
int m_state;
int m_bits;
uint8_t m_cmd;
uint8_t m_data;
int m_addr;
uint8_t m_reg[9];
uint8_t m_user[9];
uint8_t m_ram[0x20];
// timers
emu_timer *m_clock_timer;
};
// device type definition
DECLARE_DEVICE_TYPE(DS1302, ds1302_device)
#endif // MAME_MACHINE_DS1302_H
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