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The divider is by-passed. When one of the counters is read memory locations 01 to 07the contents of all counters are strobed into capture latches at the beginning of a read cycle.
In the clock modes 24 h or 12 h format can be selected by. The event counter mode is used to. Therefore, faulty reading of the count during a carry condition is prevented. The memory addresses 01 to 07 are used as counters for. The event counter mode is used to count pulses applied to the oscillator input OSCO left open-circuit. In the clock modes, the timer register.
This allows the user to read the date and month count.
(Datasheet) T pdf – INTEGRATED CIRCUITS DATA SHEET PCF Clock/ca PCFT (1-page)
In the clock modes the hundredths of a second, seconds. When a counter is written, other counters are not affected. In the event-counter mode events are stored in BCD format. In the clock modes the hundredths of a second, seconds, minutes, hours, date, month four year calendar and datashet are stored in a BCD format.
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The weekdays and months are packed into. The year and date are packed into memory location The open drain interrupt output is switched on active LOW when the alarm or timer flag is set enabled.
D5 is the most significant and D0 the dayasheet significant digit. This allows the user to read the date and month count directly. The first 16 bytes of datasjeet RAM memory addresses. In the clock modes, the timer register address 07 may be programmed to count hundredths of a second, seconds, minutes, hours or days.
The memory addresses 08 to 0F may be programmed as alarm registers or used as free RAM locations, when the alarm is disabled. A timer alarm event will set the alarm flag and an overflow condition of the timer will set the timer flag.
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The weekdays and months are packed into memory location 06 see Fig. In the different modes the counter registers are programmed and arranged as shown in Fig. The event counter stores up to 6 digits of data. The first register memory.
(Datasheet) T pdf – INTEGRATED CIRCUITS DATA SHEET PCF Clock/ca PCFT (5-page)
All functions and options are controlled by the. Whenever an alarm event occurs the alarm flag of the. The year and date are packed into memory location 05 see Fig. The event counter stores up to 6 digits of.
The first 16 bytes of the RAM memory addresses 00 to 0F are designed as addressable 8-bit parallel special function registers. By setting the alarm control register a dated alarm, a daily datssheet, a weekday alarm or a timer alarm may be programmed.
The memory addresses 01 to 07 are used as counters for the clock function.
The flags remain set until directly reset by a. The open drain interrupt output is switched.
The format of the hours counter is shown in Fig. The flags remain set until directly reset by a write operation. A timer alarm event will set. In the event-counter mode events are stored in BCD.