PCF2129AT datasheet(22/68 Pages) NXP

22 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

22 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.8 Time and date function

The majority of this registers are coded in the Binary Coded Decimal (BCD) format.

8.8.1 Register Seconds

[1]

Start-up value.

8.8.2 Register Minutes

Table 15.

Seconds - seconds and clock integrity register (address 03h) bit description

Bit

Symbol

Value

Place value Description

OSF

clock integrity is guaranteed

1[1]

clock integrity is not guaranteed:

oscillator has stopped and chip reset

has occurred since flag was last cleared

6 to 4 SECONDS

0 to 5

ten’s place

actual seconds coded in BCD format

3to0

0to9

unit place

Table 16.

Seconds coded in BCD format

Seconds value in

decimal

Upper-digit (ten’s place)

Digit (unit place)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00000

:::::

00010

00100

:::::

10110

Table 17.

Minutes - minutes register (address 04h) bit description

Bit

Symbol

Value

Place value Description

unused

6 to 4 MINUTES

0 to 5

ten’s place

actual minutes coded in BCD format

3to0

0to9

unit place

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