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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/**********************************************************************
macrtc.h - Apple 343-0042 real time clock and battery RAM
by R. Belmont
**********************************************************************/
#pragma once
#ifndef __RTC3430042_H__
#define __RTC3430042_H__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_RTC3430042_ADD(_tag, _clock) \
MCFG_DEVICE_ADD(_tag, RTC3430042, _clock)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> rtc3430042_device
class rtc3430042_device : public device_t,
public device_rtc_interface,
public device_nvram_interface
{
public:
// construction/destruction
rtc3430042_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_WRITE_LINE_MEMBER( ce_w );
DECLARE_WRITE_LINE_MEMBER( clk_w );
DECLARE_READ_LINE_MEMBER( data_r );
DECLARE_WRITE_LINE_MEMBER( data_w );
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
// 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);
virtual bool rtc_feature_leap_year() { return true; }
// device_nvram_interface overrides
virtual void nvram_default();
virtual void nvram_read(emu_file &file);
virtual void nvram_write(emu_file &file);
private:
/* state of rTCEnb and rTCClk lines */
UINT8 m_rtc_rTCEnb;
UINT8 m_rtc_rTCClk;
/* serial transmit/receive register : bits are shifted in/out of this byte */
UINT8 m_rtc_data_byte;
/* serial transmitted/received bit count */
UINT8 m_rtc_bit_count;
/* direction of the current transfer (0 : VIA->RTC, 1 : RTC->VIA) */
UINT8 m_rtc_data_dir;
/* when rtc_data_dir == 1, state of rTCData as set by RTC (-> data bit seen by VIA) */
UINT8 m_rtc_data_out;
/* set to 1 when command in progress */
UINT8 m_rtc_cmd;
/* write protect flag */
UINT8 m_rtc_write_protect;
/* internal seconds register */
UINT8 m_rtc_seconds[/*8*/4];
/* 20-byte long PRAM, or 256-byte long XPRAM */
UINT8 m_pram[256];
/* current extended address and RTC state */
UINT8 m_rtc_xpaddr;
UINT8 m_rtc_state;
UINT8 m_data_latch;
// timers
emu_timer *m_clock_timer;
void rtc_shift_data(int data);
void rtc_execute_cmd(int data);
};
// device type definition
extern const device_type RTC3430042;
#endif
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