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PCF8583

Clock and calendar with 240 x 8-bit RAM

NXP Semiconductors. 

NXP Semiconductors

PCF8583

Clock and calendar with 240 x 8-bit RAM

Table 4. Cycle length of the time counters, clock modes

Unit

Counting cycle Carry to next unit

hundredths of a second

seconds

minutes

hours (24)

hours (12)

date

months

year

weekdays

timer

00 to 99

00 to 59

00 to 59

00 to 23

12 am

01 am to 11 am

12 pm

01 pm to 11 pm

01 to 31

01 to 30

01 to 29

01 to 28

01 to 12

0 to 3

0 to 6

00 to 99

99 to 00

59 to 00

59 to 00

23 to 00

-

-

-

11 pm to 12 am

31 to 01

30 to 01

29 to 01

28 to 01

12 to 01

-

6 to 0

no carry

Contents of month

calendar

-

-

-

-

-

-

-

-

1, 3, 5, 7, 8, 10, and 12

4, 6, 9, and 11

2, year = 0

2, year = 1, 2, and 3

-

-

-

-

7.5 Alarm control register

When the alarm enable bit of the control and status register is set (address 00h, bit 2) the

alarm control register (address 08h) is activated. All alarm, timer, and interrupt output

functions are controlled by the contents of the alarm control register (see Figure 10).

PCF8583

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 06 — 6 October 2010

© NXP B.V. 2010. All rights reserved.

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