dc/d1b/rtc_8h_source.html

/*

 * PROJECT:     NEC PC-98 series onboard hardware

 * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)

 * PURPOSE:     NEC uPD1990A/uPD4990A RTC header file

 * COPYRIGHT:   Copyright 2020 Dmitry Borisov (di.sean@protonmail.com)

 */


#pragma once


#define RTC_IO_o_DATA    0x20

    /* Input terminals */

    #define RTC_DATA_INPUT                0x20

    #define RTC_CLOCK                     0x10

    #define RTC_STROBE                    0x08

    /* Commands, shift register 40 bit */

    #define RTC_CMD_REGISTER_HOLD         0x00

    #define RTC_CMD_REGISTER_SHIFT        0x01

    #define RTC_CMD_TIME_SET_COUNTER_HOLD 0x02

    #define RTC_CMD_TIME_READ             0x03

    #define RTC_CMD_TIMING_PULSE_64_HZ    0x04

    #define RTC_CMD_TIMING_PULSE_256_HZ   0x05

    #define RTC_CMD_TIMING_PULSE_2048_HZ  0x06

    #define RTC_CMD_SERIAL_TRANSFER_MODE  0x07

    /* Serial data commands, shift register 52 bit (uPD4990A only) */

    #define RTC_CMD_TIMING_PULSE_4096_HZ  0x07

    #define RTC_CMD_TIMING_PULSE_1_S_INT  0x08

    #define RTC_CMD_TIMING_PULSE_10_S_INT 0x09

    #define RTC_CMD_TIMING_PULSE_30_S_INT 0x0A

    #define RTC_CMD_TIMING_PULSE_60_S_INT 0x0B

    #define RTC_CMD_INTERRUPT_RESET       0x0C

    #define RTC_CMD_INTERRUPT_START       0x0D

    #define RTC_CMD_INTERRUPT_STOP        0x0E

    #define RTC_CMD_TEST_MODE             0x0F


#define RTC_IO_o_MODE    0x22


#define RTC_IO_o_INT_CLOCK_DIVISOR    0x128

    #define RTC_INT_CLOCK_DIVISOR_64      0x00

    #define RTC_INT_CLOCK_DIVISOR_32      0x01

    #define RTC_INT_CLOCK_DIVISOR_0       0x02

    #define RTC_INT_CLOCK_DIVISOR_16      0x03


#define RTC_IO_i_MODE    0x22

#define RTC_IO_i_INTERRUPT_RESET      0x128