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/**********************************************************************
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
**********************************************************************/
#ifndef __CDP1852__
#define __CDP1852__
#include "devlegcy.h"
/***************************************************************************
MACROS / CONSTANTS
***************************************************************************/
#define CDP1852_CLOCK_HIGH 0
DECLARE_LEGACY_DEVICE(CDP1852, cdp1852);
#define MDRV_CDP1852_ADD(_tag, _clock, _config) \
MDRV_DEVICE_ADD(_tag, CDP1852, _clock) \
MDRV_DEVICE_CONFIG(_config)
#define CDP1852_INTERFACE(_name) \
const cdp1852_interface (_name)=
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
enum _cdp1852_mode {
CDP1852_MODE_INPUT = 0,
CDP1852_MODE_OUTPUT
};
typedef enum _cdp1852_mode cdp1852_mode;
typedef struct _cdp1852_interface cdp1852_interface;
struct _cdp1852_interface
{
int mode; /* operation mode */
/* this gets called for every external data read */
devcb_read8 in_data_func;
/* this gets called for every external data write */
devcb_write8 out_data_func;
/* this gets called for every change of the SR pin (pin 23) */
devcb_write_line out_sr_func;
};
/***************************************************************************
PROTOTYPES
***************************************************************************/
/* data access */
READ8_DEVICE_HANDLER( cdp1852_data_r );
WRITE8_DEVICE_HANDLER( cdp1852_data_w );
#endif
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