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PCF8583PF5-112 Datasheet(PDF) 7 Page - NXP Semiconductors

Part No. PCF8583PF5-112
Description  Clock and calendar with 240 x 8-bit RAM
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8583PF5-112 Datasheet(HTML) 7 Page - NXP Semiconductors

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PCF8583
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© NXP B.V. 2010. All rights reserved.
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
10
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:
7
6
5
432
10
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:
76
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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