PCF8523TSSLASH1 datasheet(30/75 Pages) NXP

30 / 75 page

PCF8523

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Product data sheet

Rev. 4 — 5 July 2012

30 of 74

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.8.2 Correction when MODE = 1

The correction is triggered once per minute and then correction pulses are applied once

per second up to a maximum of 60 pulses. When correction values greater than 60 pulses

are used, additional correction pulses are made in the 59th second.

Clock correction is made more frequently in MODE = 1; however, this can result in higher

power consumption.

[1]

The correction pulses on pin INTx are 1⁄4096 s wide. For multiple pulses, they are repeated at an interval of

1⁄2048 s.

In MODE = 1, any timer source clock using a frequency below 4.096 kHz is also affected

by the clock correction (see Table 33).

Table 32.

Correction pulses for MODE = 1

Correction value

Minute

Second

Correction pulses on

INT1 per second[1]

+1 or

1

02001

+2 or

2

00 and 01

+3 or

3

00, 01, and 02

::::

+59 or

59

00 to 58

+60 or

60

00 to 59

+61 or

61

00 to 58

+62 or

62

00 to 58

+63 or

63

00 to 58

64

00 to 58

Table 33.

Effect of clock correction for MODE = 1

CLKOUT frequency (Hz)

Effect of correction

Timer source clock

frequency (Hz)

Effect of

correction

32768

no effect

4096

no effect

16384

no effect

affected

8192

no effect

affected

4096

no effect

1⁄60

affected

1024

no effect

1⁄3600

affected

1affected

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