PCF2131 datasheet(34/86 Pages) NXP

34 / 86 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

Bit

Symbol

Value

Place value Description

second alarm is enabled

AE_S

second alarm is disabled

6 to 4

0 to 5

ten’s place

3 to 0

SECOND_ALARM

0 to 9

unit place

second alarm information coded in BCD format

Table 46. Second_alarm - second alarm register (address 0Eh) bit description

7.10.2 Register Minute_alarm

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

AE_M

MINUTE_ALARM (0 to 59)

Reset

value

Table 47. Minute_alarm - minute alarm register (address 0Fh) bit allocation

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

Value

Place value Description

minute alarm is enabled

AE_M

minute alarm is disabled

6 to 4

0 to 5

ten’s place

3 to 0

MINUTE_ALARM

0 to 9

unit place

minute alarm information coded in BCD format

Table 48. Minute_alarm - minute alarm register (address 0Fh) bit description

7.10.3 Register Hour_alarm

Bits labeled as T are unused and return 0 when read. Bits labeled as X are undefined at power-on and unchanged by

subsequent resets.

Bit

AMPM

HOUR_ALARM (1 to 12) in 12-hour mode

Symbol

AE_H

HOUR_ALARM (0 to 23) in 24-hour mode

Reset

value

Table 49. Hour_alarm - hour alarm register (address 10h) 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

Value

Place value Description

hour alarm is enabled

AE_H

hour alarm is disabled

Table 50. Hour_alarm - hour alarm register (address 10h) bit description

PCF2131

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Product data sheet

Rev. 1.0 — 28 May 2021

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