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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
RCA CDP1852 Byte-Wide Input/Output Port emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
CSI/_CSI 1 |* \_/ | 24 Vdd
MODE 2 | | 23 _SR/SR
DI0 3 | | 22 DI7
DO0 4 | | 21 DO7
DI1 5 | | 20 DI6
DO1 6 | CDP1852 | 19 DO6
DI2 7 | | 18 DI5
DO2 8 | | 17 DO5
DI3 9 | | 16 DI4
DO3 10 | | 15 DO4
CLOCK 11 | | 14 _CLEAR
Vss 12 |_____________| 13 CS2
**********************************************************************/
#pragma once
#ifndef __CDP1852__
#define __CDP1852__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_CDP1852_MODE_CALLBACK(_read) \
devcb = &cdp1852_device::set_mode_rd_callback(*device, DEVCB_##_read);
#define MCFG_CDP1852_SR_CALLBACK(_write) \
devcb = &cdp1852_device::set_sr_wr_callback(*device, DEVCB_##_write);
#define MCFG_CDP1852_DI_CALLBACK(_read) \
devcb = &cdp1852_device::set_data_rd_callback(*device, DEVCB_##_read);
#define MCFG_CDP1852_DO_CALLBACK(_write) \
devcb = &cdp1852_device::set_data_wr_callback(*device, DEVCB_##_write);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> cdp1852_device
class cdp1852_device : public device_t
{
public:
// construction/destruction
cdp1852_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
template<class _Object> static devcb_base &set_mode_rd_callback(device_t &device, _Object object) { return downcast<cdp1852_device &>(device).m_read_mode.set_callback(object); }
template<class _Object> static devcb_base &set_sr_wr_callback(device_t &device, _Object object) { return downcast<cdp1852_device &>(device).m_write_sr.set_callback(object); }
template<class _Object> static devcb_base &set_data_rd_callback(device_t &device, _Object object) { return downcast<cdp1852_device &>(device).m_read_data.set_callback(object); }
template<class _Object> static devcb_base &set_data_wr_callback(device_t &device, _Object object) { return downcast<cdp1852_device &>(device).m_write_data.set_callback(object); }
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
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);
private:
void set_sr_line(int state);
devcb_read_line m_read_mode;
devcb_write_line m_write_sr;
devcb_read8 m_read_data;
devcb_write8 m_write_data;
int m_new_data; // new data written
UINT8 m_data; // data latch
UINT8 m_next_data; // next data
int m_sr; // service request flag
int m_next_sr; // next value of service request flag
// timers
emu_timer *m_scan_timer;
};
// device type definition
extern const device_type CDP1852;
#endif
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