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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(_devcb) \
devcb = &i8243_device::set_read_handler(*device, DEVCB2_##_devcb); \
#define MCFG_I8243_WRITEHANDLER(_devcb) \
devcb = &i8243_device::set_write_handler(*device, DEVCB2_##_devcb); \
/***************************************************************************
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);
// static configuration helpers
template<class _Object> static devcb2_base &set_read_handler(device_t &device, _Object object) { return downcast<i8243_device &>(device).m_readhandler.set_callback(object); }
template<class _Object> static devcb2_base &set_write_handler(device_t &device, _Object object) { return downcast<i8243_device &>(device).m_writehandler.set_callback(object); }
DECLARE_READ8_MEMBER(i8243_p2_r);
DECLARE_WRITE8_MEMBER(i8243_p2_w);
DECLARE_WRITE8_MEMBER(i8243_prog_w);
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 */
devcb2_read8 m_readhandler;
devcb2_write8 m_writehandler;
};
// device type definition
extern const device_type I8243;
#endif /* __I8243_H__ */
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