PCF2123_09 datasheet(29/55 Pages) NXP

29 / 55 page

PCF2123_2

Product data sheet

Rev. 02 — 4 December 2009

29 of 55

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

[1]

Example is given in a time range from 2:00 to 2:59.

[2]

Correction INT pulses are 1

⁄

128 s wide. For multiple pulses they are repeated at

⁄

64 s interval.

It is possible to monitor when correction pulses are applied. The correction interrupt

enable mode (bit CIE) will generate a 1

⁄

128 second pulse on INT for every correction

applied. In the case where multiple correction pulses are applied, a 1

⁄

128 second interrupt

pulse will be generated and repeated every 1

⁄

64 seconds.

Correction is applied to the 1 Hz clock. Any timer or clock output using a frequency of 1 Hz

or below will also be affected by the correction pulses.

Table 38.

Correction pulses for course mode

Correction value

Hour:Minute[1]

Correction pulses on INT per

minute[2]

+1 or

−1

02:00

02:01 to

02:59

+2 or

−2

02:00

02:01

02:02 to

02:59

+3 or

−3

02:00

02:01

02:02

02:03 to

02:59

:::

+59 or

−59

02:00 to

02:58

02:59

+60 or

−60

02:00 to

02:59

+61 or

−61

02:00 to

02:58

02:59

+62 or

−62

02:00 to

02:58

02:59

+63 or

−63

02:00 to

02:58

02:59

−64

02:00 to

02:58

02:59

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