PCF2131 datasheet(28/86 Pages) NXP

28 / 86 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

Upper-digit (ten’s place)

Digit (unit place)

Seconds

value in

decimal

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 30. Seconds coded in BCD format...continued

7.9.3 Register Minutes

Bits labeled as T are unused and return 0 when read

Bit

Symbol

MINUTES (0 to 59)

Reset

value

Table 31. Minutes - minutes register (address 08h) bit allocation

Bits labeled as T are unused and return 0 when read

Bit

Symbol

Value

Place value Description

unused

6 to 4

0 to 5

ten’s place

3 to 0

MINUTES

0 to 9

unit place

actual minutes coded in BCD format

Table 32. Minutes - minutes register (address 08h) bit description

7.9.4 Register Hours

Bits labeled as T are unused and return 0 when read

Bit

AMPM

HOURS (1 to 12) in 12-hour mode

Symbol

HOURS (0 0to 23) in 24-hour mode

Reset

value

Table 33. Hours - hours register (address 09h) bit allocation

Bits labeled as T are unused and return 0 when read

Bit

Symbol

Value

Place value Description

7 to 6

unused

12-hour mode[1]

indicates AM

AMPM

indicates PM

Table 34. Hours - hours register (address 09h) bit description

PCF2131

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.1 — 15 October 2021

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