// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** MM74C922/MM74C923 16/20-Key Encoder emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. ********************************************************************** _____ _____ ROW Y1 1 |* \_/ | 18 Vcc ROW Y2 2 | | 17 DATA OUT A ROW Y3 3 | | 16 DATA OUT B ROW Y4 4 | | 15 DATA OUT C OSCILLATOR 5 | MM74C922 | 14 DATA OUT D KEYBOUNCE MASK 6 | | 13 _OUTPUT ENABLE COLUMN X4 7 | | 12 DATA AVAILABLE COLUMN X3 8 | | 11 COLUMN X1 GND 9 |_____________| 10 COLUMN X2 _____ _____ ROW Y1 1 |* \_/ | 20 Vcc ROW Y2 2 | | 19 DATA OUT A ROW Y3 3 | | 18 DATA OUT B ROW Y4 4 | | 17 DATA OUT C ROW Y5 5 | MM74C923 | 16 DATA OUT D OSCILLATOR 6 | | 15 DATA OUT E KEYBOUNCE MASK 7 | | 14 _OUTPUT ENABLE COLUMN X4 8 | | 13 DATA AVAILABLE COLUMN X3 9 | | 12 COLUMN X1 GND 10 |_____________| 11 COLUMN X2 **********************************************************************/ #pragma once #ifndef __MM74C922__ #define __MM74C922__ #include "emu.h" //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_MM74C922_OSC(_value) \ mm74c922_device::static_set_cap_osc(*device, _value); #define MCFG_MM74C922_DEBOUNCE(_value) \ mm74c922_device::static_set_cap_debounce(*device, _value); #define MCFG_MM74C922_DA_CALLBACK(_write) \ devcb = &mm74c922_device::set_da_wr_callback(*device, DEVCB2_##_write); #define MCFG_MM74C922_X1_CALLBACK(_read) \ devcb = &mm74c922_device::set_x1_rd_callback(*device, DEVCB2_##_read); #define MCFG_MM74C922_X2_CALLBACK(_read) \ devcb = &mm74c922_device::set_x2_rd_callback(*device, DEVCB2_##_read); #define MCFG_MM74C922_X3_CALLBACK(_read) \ devcb = &mm74c922_device::set_x3_rd_callback(*device, DEVCB2_##_read); #define MCFG_MM74C922_X4_CALLBACK(_read) \ devcb = &mm74c922_device::set_x4_rd_callback(*device, DEVCB2_##_read); #define MCFG_MM74C922_X5_CALLBACK(_read) \ devcb = &mm74c922_device::set_x5_rd_callback(*device, DEVCB2_##_read); //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> mm74c922_device class mm74c922_device : public device_t { public: // construction/destruction mm74c922_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); static void static_set_cap_osc(device_t &device, double value) { downcast(device).m_cap_osc = value; } static void static_set_cap_debounce(device_t &device, double value) { downcast(device).m_cap_debounce = value; } template static devcb2_base &set_da_wr_callback(device_t &device, _Object object) { return downcast(device).m_write_da.set_callback(object); } template static devcb2_base &set_x1_rd_callback(device_t &device, _Object object) { return downcast(device).m_read_x1.set_callback(object); } template static devcb2_base &set_x2_rd_callback(device_t &device, _Object object) { return downcast(device).m_read_x2.set_callback(object); } template static devcb2_base &set_x3_rd_callback(device_t &device, _Object object) { return downcast(device).m_read_x3.set_callback(object); } template static devcb2_base &set_x4_rd_callback(device_t &device, _Object object) { return downcast(device).m_read_x4.set_callback(object); } template static devcb2_base &set_x5_rd_callback(device_t &device, _Object object) { return downcast(device).m_read_x5.set_callback(object); } UINT8 read(); protected: // device-level overrides virtual void device_start(); virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); private: void change_output_lines(); void clock_scan_counters(); void detect_keypress(); devcb2_write_line m_write_da; devcb2_read8 m_read_x1; devcb2_read8 m_read_x2; devcb2_read8 m_read_x3; devcb2_read8 m_read_x4; devcb2_read8 m_read_x5; double m_cap_osc; double m_cap_debounce; int m_max_y; int m_inhibit; // scan counter clock inhibit int m_x; // currently scanned column int m_y; // latched row UINT8 m_data; // data latch int m_da; // data available flag int m_next_da; // next value of data available flag // timers emu_timer *m_scan_timer; // keyboard scan timer }; // device type definition extern const device_type MM74C922; extern const device_type MM74C923; #endif