/********************************************************************** 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" //************************************************************************** // MACROS / CONSTANTS //************************************************************************** #define CDP1852_CLOCK_HIGH 0 #define CDP1852_MODE_INPUT \ DEVCB_LINE_GND #define CDP1852_MODE_OUTPUT \ DEVCB_LINE_VCC //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_CDP1852_ADD(_tag, _clock, _config) \ MCFG_DEVICE_ADD(_tag, CDP1852, _clock) \ MCFG_DEVICE_CONFIG(_config) #define CDP1852_INTERFACE(name) \ const cdp1852_interface (name)= //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> cdp1852_interface struct cdp1852_interface { devcb_read_line m_in_mode_cb; devcb_read8 m_in_data_cb; devcb_write8 m_out_data_cb; devcb_write_line m_out_sr_cb; }; // ======================> cdp1852_device class cdp1852_device : public device_t, public cdp1852_interface { public: // construction/destruction cdp1852_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); DECLARE_READ8_MEMBER( read ); DECLARE_WRITE8_MEMBER( write ); protected: // device-level overrides virtual void device_config_complete(); virtual void device_start(); virtual void device_reset(); virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); private: int get_mode(); inline void set_sr_line(int state); devcb_resolved_read_line m_in_mode_func; devcb_resolved_write_line m_out_sr_func; devcb_resolved_read8 m_in_data_func; devcb_resolved_write8 m_out_data_func; 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