PCF2127AT datasheet(39/100 Pages) PHILIPS

39 / 100 page

PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

39 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

8.10.3 Register Hour_alarm

[1]

Hour mode is set by the bit 12_24 in register Control_1.

8.10.4 Register Day_alarm

Table 48.

Hour_alarm - hour alarm register (address 0Ch) 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

AE_H

AMPM

HOUR_ALARM (1 to 12) in 12-hour mode

HOUR_ALARM (0 to 23) in 24-hour mode

Reset

value

XXX

Table 49.

Hour_alarm - hour alarm register (address 0Ch) 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

AE_H

hour alarm is enabled

hour alarm is disabled

--unused

12-hour mode[1]

AMPM

indicates AM

indicates PM

HOUR_ALARM

0 to 1

ten’s place

hour alarm information coded in BCD format when in

12-hour mode

3to0

0 to9

unit place

24-hour mode[1]

5 to 4

HOUR_ALARM

0 to 2

ten’s place

hour alarm information coded in BCD format when in

24-hour mode

3to0

0 to9

unit place

Table 50.

Day_alarm - day alarm register (address 0Dh) 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

AE_D

DAY_ALARM (1 to 31)

Reset

value

XXX

Table 51.

Day_alarm - day alarm register (address 0Dh) 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

AE_D

day alarm is enabled

day alarm is disabled

--unused

5 to 4

DAY_ALARM

0 to 3

ten’s place

day alarm information coded in BCD format

3to0

0 to9

unit place

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