PCF8593 datasheet(8/35 Pages) NXP

Part #	PCF8593

Description	Low power clock and calendar

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCF8593

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Product data sheet

Rev. 04 — 6 October 2010

8 of 35

NXP Semiconductors

PCF8593

Low power clock and calendar

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 9).

Table 4.

Cycle length of the time counters, clock modes

Unit

Counting cycle

Carry to next unit

Contents of month

calendar

hundredths of a second

00 to 99

99 to 00

-

seconds

00 to 59

59 to 00

-

minutes

00 to 59

59 to 00

-

hours (24)

00 to 23

23 to 00

-

hours (12)

12 am

-

01 am to 11 am

-

12 pm

-

01 pm to 11 pm

11 pm to 12 am

-

date

01 to 31

31 to 01

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

01 to 30

30 to 01

4, 6, 9, and 11

01 to 29

29 to 01

2, year = 0

01 to 28

28 to 01

2, year = 1, 2, and 3

months

01 to 12

12 to 01

-

year

0 to 3

-

weekdays

0 to 6

6 to 0

-

timer

00 to 99

no carry

-

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