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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Intel 8155/8156 - 2048-Bit Static MOS RAM with I/O Ports and Timer emulation
8156 is the same as 8155, except that chip enable is active high instead of low
**********************************************************************
_____ _____
PC3 1 |* \_/ | 40 Vcc
PC4 2 | | 39 PC2
TIMER IN 3 | | 38 PC1
RESET 4 | | 37 PC0
PC5 5 | | 36 PB7
_TIMER OUT 6 | | 35 PB6
IO/_M 7 | | 34 PB5
CE or _CE 8 | | 33 PB4
_RD 9 | | 32 PB3
_WR 10 | 8155 | 31 PB2
ALE 11 | 8156 | 30 PB1
AD0 12 | | 29 PB0
AD1 13 | | 28 PA7
AD2 14 | | 27 PA6
AD3 15 | | 26 PA5
AD4 16 | | 25 PA4
AD5 17 | | 24 PA3
AD6 18 | | 23 PA2
AD7 19 | | 22 PA1
Vss 20 |_____________| 21 PA0
**********************************************************************/
#pragma once
#ifndef __I8155__
#define __I8155__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_I8155_IN_PORTA_CB(_devcb) \
devcb = &i8155_device::set_in_pa_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_IN_PORTB_CB(_devcb) \
devcb = &i8155_device::set_in_pb_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_IN_PORTC_CB(_devcb) \
devcb = &i8155_device::set_in_pc_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_OUT_PORTA_CB(_devcb) \
devcb = &i8155_device::set_out_pa_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_OUT_PORTB_CB(_devcb) \
devcb = &i8155_device::set_out_pb_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_OUT_PORTC_CB(_devcb) \
devcb = &i8155_device::set_out_pc_callback(*device, DEVCB_##_devcb);
#define MCFG_I8155_OUT_TIMEROUT_CB(_devcb) \
devcb = &i8155_device::set_out_to_callback(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> i8155_device
class i8155_device : public device_t,
public device_memory_interface
{
public:
// construction/destruction
i8155_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
template<class _Object> static devcb_base &set_in_pa_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_in_pa_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_pb_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_in_pb_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_pc_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_in_pc_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_pa_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_out_pa_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_pb_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_out_pb_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_pc_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_out_pc_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_to_callback(device_t &device, _Object object) { return downcast<i8155_device &>(device).m_out_to_cb.set_callback(object); }
DECLARE_READ8_MEMBER( io_r );
DECLARE_WRITE8_MEMBER( io_w );
DECLARE_READ8_MEMBER( memory_r );
DECLARE_WRITE8_MEMBER( memory_w );
DECLARE_WRITE8_MEMBER( ale_w );
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);
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
inline UINT8 get_timer_mode();
inline void timer_output();
inline void pulse_timer_output();
inline int get_port_mode(int port);
inline UINT8 read_port(int port);
inline void write_port(int port, UINT8 data);
void register_w(int offset, UINT8 data);
private:
devcb_read8 m_in_pa_cb;
devcb_read8 m_in_pb_cb;
devcb_read8 m_in_pc_cb;
devcb_write8 m_out_pa_cb;
devcb_write8 m_out_pb_cb;
devcb_write8 m_out_pc_cb;
// this gets called for each change of the TIMER OUT pin (pin 6)
devcb_write_line m_out_to_cb;
// CPU interface
int m_io_m; // I/O or memory select
UINT8 m_ad; // address
// registers
UINT8 m_command; // command register
UINT8 m_status; // status register
UINT8 m_output[3]; // output latches
// counter
UINT16 m_count_length; // count length register
UINT16 m_counter; // counter register
int m_to; // timer output
// timers
emu_timer *m_timer; // counter timer
const address_space_config m_space_config;
};
// device type definition
extern const device_type I8155;
extern const device_type I8156;
#endif
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