PCF8583P datasheet(7/37 Pages) NXP

7 / 37 page

PCF8583

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Product data sheet

Rev. 06 — 6 October 2010

7 of 37

NXP Semiconductors

PCF8583

Clock and calendar with 240 x 8-bit RAM

7.4 Counter registers

The format for 24 hour or 12 hour clock modes can be selected by setting the most

significant bit of the hours counter register. The format of the hours counter is shown in

Figure 6.

The year and date are stored in memory location 05h (see Figure 7). The weekdays and

months are in memory location 06h (see Figure 8).

When reading these memory locations the year and weekdays are masked out when the

mask flag of the control and status register is set. This allows the user to read the date

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. The divider is by-passed.

Fig 6.

Format of the hours counter

Fig 7.

Format of the year and date counter

Fig 8.

Format of the weekdays and month counter

765

432

MSB

LSB

013aaa371

memory location 04h (hours counter)

reset state: 0000 0000

unit place

ten's place (0 to 2 binary)

AM/PM flag:

logic 0: AM

logic 1: PM

format:

logic 0: 24 hour format, AM/PM flag remains unchanged

logic 1: 12 h format, AM/PM flag will be updated

hours in BCD format:

432

MSB

LSB

013aaa372

unit place

ten's place (0 to 3 binary)

year (0 to 3 binary, read as logic 0

if the mask flag is set)

memory location 05h (year/date)

reset state: 0000 0001

days in BCD format:

543

210

MSB

LSB

013aaa373

memory location 06h (weekdays/months)

reset state: 0000 0001

unit place

ten's place

weekdays (0 to 6 binary, read as logic 0

if the mask flag is set)

months in BCD format:

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