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/***************************************************************************

    v3021.h

    EM Microelectronic-Marin SA Ultra Low Power 32kHz CMOS RTC (DIP8)

    Serial Real Time Clock

***************************************************************************/

#pragma once

#ifndef __v3021DEV_H__
#define __v3021DEV_H__



//**************************************************************************
//  INTERFACE CONFIGURATION MACROS
//**************************************************************************

#define MCFG_V3021_ADD(_tag) \
	MCFG_DEVICE_ADD(_tag, v3021, XTAL_32_768kHz) \


//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

struct rtc_regs_t 
{
	UINT8 sec, min, hour, day, wday, month, year;
};


// ======================> v3021_device

class v3021_device :	public device_t
{
public:
	// construction/destruction
	v3021_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);

	// I/O operations
	DECLARE_WRITE8_MEMBER( write );
	DECLARE_READ8_MEMBER( read );
	void timer_callback();

protected:
	// device-level overrides
	virtual void device_validity_check(validity_checker &valid) const;
	virtual void device_start();
	virtual void device_reset();

	inline UINT8 rtc_read(UINT8 offset);
	inline void rtc_write(UINT8 offset,UINT8 data);

	static TIMER_CALLBACK( rtc_inc_callback );

	UINT8 m_cal_mask,m_cal_com,m_cal_cnt,m_cal_val;

	rtc_regs_t m_rtc;
};


// device type definition
extern const device_type v3021;



//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************



#endif