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The first 16 bytes of the RAM memory addresses. The vatasheet register memory. The memory addresses 01 to 07 are used as counters for. The memory addresses 08 to 0F may.
(Datasheet) T pdf – INTEGRATED CIRCUITS DATA SHEET PCF Clock/ca PCFT (5-page)
In the clock modes the hundredths of a second, seconds. The event counter mode is used to. The event counter stores up to 6 digits of. When one of the counters is read memory locations. When a counter is written, other counters are not affected. By setting the alarm control register a dated alarm, a daily.
In the clock modes, the timer register. Whenever an alarm event occurs the alarm flag of the. A timer alarm event will set. The open drain interrupt output is switched. The flags remain set until directly reset by a. All functions and options are controlled by the. In the clock modes 24 h or 12 h format can be selected by.
The format of the hours counter is shown in Fig.
The year and date are packed into memory location The weekdays and months are packed into. This allows the user to read the date and month count. In the event-counter mode events are stored in BCD. D5 is the most significant and D0 the least. The divider is by-passed.
In the different modes the counter registers are. The first 16 bytes of the RAM memory addresses 00 to 0F are designed as addressable 8-bit parallel special function registers.
The memory addresses 01 to 07 are used as counters for the clock function. The memory addresses 08 to 0F may be programmed as alarm registers or used as free 8583g locations, when the alarm is disabled. In the clock modes the hundredths of a second, seconds, minutes, hours, date, month four year calendar and weekday are stored in a BCD format.
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The timer register stores up to 99 days. The event counter mode is used to count pulses applied to the oscillator input OSCO left open-circuit. The event counter stores up to datawheet digits of data. When one of the counters datashest read memory locations 01 to 07the contents of all counters are strobed into capture latches at the beginning of a read cycle.
Therefore, faulty reading of the count during a carry condition is prevented. By setting the alarm control register a dated alarm, a daily alarm, a weekday alarm or a timer alarm may be programmed. In the clock modes, the timer register address 07 may be programmed to count hundredths of a second, seconds, minutes, hours or days. Days are counted when an alarm is not programmed.
A timer alarm event will set the alarm flag and an overflow condition of the timer will set the timer flag.
The open drain interrupt output is switched on active LOW when the alarm or timer flag is set enabled. The flags remain set until directly reset by a write operation.
The year and date are packed into memory location 05 see Fatasheet. The weekdays and months are packed into memory location 06 see Fig.
This allows the user to read the datxsheet and month count directly. In the event-counter mode events are stored in BCD format.
D5 is the most significant and D0 the least significant digit. In the different modes the counter registers are programmed and arranged as shown in Fig.
Counter cycles are listed in Table 1.