PCF2129AT datasheet(26/86 Pages) PHILIPS

26 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

26 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.8.2 Register Minutes

Table 23.

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

000

001

000

010

:::

000

001

000

:::

101

000

101

001

Table 24.

Minutes - minutes register (address 04h) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

MINUTES (0 to 59)

Reset

value

XXX

Table 25.

Minutes - minutes register (address 04h) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

Value

Place value Description

--unused

6 to 4

MINUTES

0 to 5

ten’s place

actual minutes coded in BCD format

3to0

0 to9

unit place

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