/* rtc65271.h: include file for rtc65271.c */ #ifndef __RTC65271_H__ #define __RTC65271_H__ //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_RTC65271_ADD(_tag, _config) \ MCFG_DEVICE_ADD(_tag, RTC65271, 0) \ MCFG_DEVICE_CONFIG(_config) // ======================> rtc65271_interface struct rtc65271_interface { devcb_write_line m_interrupt_cb; }; // ======================> rtc65271_device class rtc65271_device : public device_t, public device_nvram_interface, public rtc65271_interface { public: // construction/destruction rtc65271_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); protected: // device-level overrides virtual void device_config_complete(); virtual void device_start(); // device_nvram_interface overrides virtual void nvram_default(); virtual void nvram_read(emu_file &file); virtual void nvram_write(emu_file &file); public: DECLARE_READ8_MEMBER( rtc_r ); DECLARE_READ8_MEMBER( xram_r ); DECLARE_WRITE8_MEMBER( rtc_w ); DECLARE_WRITE8_MEMBER( xram_w ); private: UINT8 read(int xramsel, offs_t offset); void write(int xramsel, offs_t offset, UINT8 data); void field_interrupts(); static TIMER_CALLBACK( rtc_SQW_callback ); static TIMER_CALLBACK( rtc_begin_update_callback ); static TIMER_CALLBACK( rtc_end_update_callback ); void rtc_SQW_cb(); void rtc_begin_update_cb(); void rtc_end_update_cb(); /* 64 8-bit registers (10 clock registers, 4 control/status registers, and 50 bytes of user RAM) */ UINT8 m_regs[64]; UINT8 m_cur_reg; /* extended RAM: 4kbytes of battery-backed RAM (in pages of 32 bytes) */ UINT8 m_xram[4096]; UINT8 m_cur_xram_page; /* update timer: called every second */ emu_timer *m_update_timer; /* SQW timer: called every periodic clock half-period */ emu_timer *m_SQW_timer; UINT8 m_SQW_internal_state; /* callback called when interrupt pin state changes (may be NULL) */ devcb_resolved_write_line m_interrupt_func; }; // device type definition extern const device_type RTC65271; #endif