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/***************************************************************************
i8243.h
Intel 8243 Port Expander
Copyright Aaron Giles
***************************************************************************/
#pragma once
#ifndef __I8243_H__
#define __I8243_H__
#include "emu.h"
#include "cpu/mcs48/mcs48.h"
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_I8243_ADD(_tag, _read, _write) \
MCFG_DEVICE_ADD(_tag, I8243, 0) \
MCFG_I8243_READHANDLER(_read) \
MCFG_I8243_WRITEHANDLER(_write) \
#define MCFG_I8243_READHANDLER(_read) \
i8243_device::static_set_read_handler(*device, _read); \
#define MCFG_I8243_WRITEHANDLER(_write) \
i8243_device::static_set_write_handler(*device, _write); \
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> i8243_device
class i8243_device : public device_t
{
public:
// construction/destruction
i8243_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
// inline configuration helpers
static void static_set_read_handler(device_t &device, read8_device_func callback);
static void static_set_write_handler(device_t &device, write8_device_func callback);
UINT8 i8243_p2_r(UINT32 offset);
void i8243_p2_w(UINT32 offset, UINT8 data);
void i8243_prog_w(UINT32 offset, UINT8 data);
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_post_load() { }
virtual void device_clock_changed() { }
private:
UINT8 m_p[4]; /* 4 ports' worth of data */
UINT8 m_p2out; /* port 2 bits that will be returned */
UINT8 m_p2; /* most recent port 2 value */
UINT8 m_opcode; /* latched opcode */
UINT8 m_prog; /* previous PROG state */
devcb_read8 m_readhandler_cb;
devcb_write8 m_writehandler_cb;
devcb_resolved_read8 m_readhandler;
devcb_resolved_write8 m_writehandler;
};
// device type definition
extern const device_type I8243;
/***************************************************************************
PROTOTYPES
***************************************************************************/
READ8_DEVICE_HANDLER( i8243_p2_r );
WRITE8_DEVICE_HANDLER( i8243_p2_w );
WRITE8_DEVICE_HANDLER( i8243_prog_w );
#endif /* __I8243_H__ */
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