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RV5C386A Datasheet(PDF) 32 Page - RICOH electronics devices division |
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RV5C386A Datasheet(HTML) 32 Page - RICOH electronics devices division |
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32 / 42 page  RV5C386A PRELIMINARY 12345 - 32 - 14.4. Alarm and Periodic Interrupt The RV5C386A incorporates the alarm interrupt circuit and the periodic interrupt circuit that are configured to generate alarm signals and periodic interrupt signals, respectively, for output from the /INTRA or /INTRB pins as described below. (1) Alarm Interrupt Circuit The alarm interrupt circuit is configured to generate alarm signals for output from the /INTRA or /INTRB, which is driven low (enabled) upon the occurrence of a match between current time read by the time counters (the day-of-week, hour, and minute counters) and alarm time preset by the alarm registers (the Alarm_W registers intended for the day-of-week, hour, and minute digit settings and the Alarm_D registers intended for the hour and minute digit settings). The Alarm_W is output from the /INTRB, and the Alarm_D is output from /INTRA. (2) Periodic Interrupt Circuit The periodic interrupt circuit is configured to generate either clock pulses in the pulse mode or interrupt signals in the level mode for output from the /INTRA pin depending on the CT2, CT1, and CT0 bit settings in the control register 1. The above two types of interrupt signals are monitored by the flag bits (i.e. the WAFG, DAFG, and CTFG bits in the Control Register 2) and enabled or disabled by the enable bits (i.e. the WALE, DALE, CT2, CT1, and CT0 bits in the Control Register 1) as listed in the table below. Flag bits Enable bits Output Pin Alarm_W WAFG (D1 at Address Fh) WALE (D7 at Address Eh) /INTRB Alarm_D DAFG (D0 at Address Fh) DALE (D6 at Address Eh) /INTRA Peridic Interrupt CTFG (D2 at Address Fh) CT2=CT1=CT0=0 (These bit setting of “0” disable the Periodic Interrupt) (D2 to D0 at Address Eh) /INTRA * At power-on, when the WALE, DALE, CT2, CT1, and CT0 bits are set to 0 in the Control Register 1, the /INTRA and /INTRB pins are driven high (disabled). * When two types of interrupt signals are output simultaneously from the /INTRA pin, the output from the /INTRA pin becomes an OR waveform of their negative logic. Example: Combined Output to /INTRA Pin Under Control of /ALARM_D and Periodic Interrupt Periodic Interrupt /INTRA /Alarm_D In this event, which type of interrupt signal is output from the /INTRA pin can be confirmed by reading the DAFG, and CTFG bit settings in the Control Register 2. 14.4.1. Alarm Interrupt The alarm interrupt circuit is controlled by the enable bits (i.e. the WALE and DALE bits in the Control Register 1) and the flag bits (i.e. the WAFG and DAFG bits in the Control Register 2). The enable bits can be used to enable this circuit when set to 1 and to disable it when set to 0. When intended for reading, the flag bits can be used to monitor alarm interrupt signals. When intended for writing, the flag bits will cause no event when set to 1 and will drive high (disable) the alarm interrupt circuit when set to 0. The enable bits will not be affected even when the flag bits are set to 0. In this event, therefore, the alarm interrupt circuit will continue to function until it is driven low (enabled) upon the next occurrence of a match between current time and preset alarm time. |
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