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/**********************************************************************
DALLAS DS1302
RTC + BACKUP RAM
**********************************************************************/
#pragma once
#ifndef __DS1302_H__
#define __DS1302_H__
#include "emu.h"
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_DS1302_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, DS1302, 0)
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> ds1302_device_config
class ds1302_device_config : public device_config
{
friend class ds1302_device;
// construction/destruction
ds1302_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
public:
// allocators
static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
virtual device_t *alloc_device(running_machine &machine) const;
};
// ======================> ds1302_device
class ds1302_device : public device_t
{
friend class ds1302_device_config;
// construction/destruction
ds1302_device(running_machine &_machine, const ds1302_device_config &_config);
public:
void ds1302_dat_w(UINT32 offset, UINT8 data);
void ds1302_clk_w(UINT32 offset, UINT8 data);
UINT8 ds1302_read(UINT32 offset);
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_post_load() { }
virtual void device_clock_changed() { }
private:
UINT32 m_shift_in;
UINT8 m_shift_out;
UINT8 m_icount;
UINT8 m_last_clk;
UINT8 m_last_cmd;
UINT8 m_sram[0x20];
const ds1302_device_config &m_config;
};
// device type definition
extern const device_type DS1302;
/***************************************************************************
PROTOTYPES
***************************************************************************/
extern WRITE8_DEVICE_HANDLER( ds1302_dat_w );
extern WRITE8_DEVICE_HANDLER( ds1302_clk_w );
extern READ8_DEVICE_HANDLER( ds1302_read );
#endif /* __DS1302_H__ */
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