// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Dallas DS1302 Trickle-Charge Timekeeping Chip emulation ********************************************************************** _____ _____ Vcc2 1 |* \_/ | 8 Vcc1 X1 2 | | 7 SCLK X2 3 | | 6 I/O GND 4 |_____________| 5 CE **********************************************************************/ #pragma once #ifndef __DS1302_H__ #define __DS1302_H__ #include "emu.h" //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_DS1302_ADD(_tag, _clock) \ MCFG_DEVICE_ADD(_tag, DS1302, _clock) //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> ds1302_device class ds1302_device : public device_t, public device_rtc_interface, public device_nvram_interface { public: // construction/destruction ds1302_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); DECLARE_WRITE_LINE_MEMBER( ce_w ); DECLARE_WRITE_LINE_MEMBER( sclk_w ); DECLARE_WRITE_LINE_MEMBER( io_w ); DECLARE_READ_LINE_MEMBER( io_r ); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; // device_nvram_interface overrides virtual void nvram_default() override; virtual void nvram_read(emu_file &file) override; virtual void nvram_write(emu_file &file) override; // device_rtc_interface overrides virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override; virtual bool rtc_feature_leap_year() override { return true; } private: void load_shift_register(); void input_bit(); void output_bit(); int m_ce; int m_clk; int m_io; int m_state; int m_bits; UINT8 m_cmd; UINT8 m_data; int m_addr; UINT8 m_reg[9]; UINT8 m_user[9]; UINT8 m_ram[0x20]; // timers emu_timer *m_clock_timer; }; // device type definition extern const device_type DS1302; #endif