PCF2129A datasheet(28/69 Pages) NXP

28 / 69 page

PCF2129A_2

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Product data sheet

Rev. 02 — 7 May 2010

28 of 69

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.9.2 Register Minute_alarm

[1]

Default value.

8.9.3 Register Hour_alarm

[1]

Default value.

[2]

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

8.9.4 Register Day_alarm

[1]

Default value.

Table 26.

Minute_alarm - minute alarm register (address 0Bh) bit description

Bit

Symbol

Value

Place value Description

AE_M

minute alarm is enabled

1[1]

minute alarm is disabled

6 to 4 MINUTE_ALARM

0 to 5

ten’s place

minute alarm information coded in BCD

format

3to0

0to9

unit place

Table 27.

Hour_alarm - hour alarm register (address 0Ch) bit description

Bit

Symbol

Value

Place value Description

AE_H

hour alarm is enabled

1[1]

hour alarm is disabled

unused

12 hour mode[2]

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

0to9

unit place

24 hour mode[2]

5 to 4 HOUR_ALARM

0 to 2

ten’s place

hour alarm information coded in BCD

format when in 24 hour mode

3to0

0to9

unit place

Table 28.

Day_alarm - day rearm register (address 0Dh) bit description

Bit

Symbol

Value

Place value Description

AE_D

day alarm is enabled

1[1]

day alarm is disabled

unused

5 to 4 DAY_ALARM

0 to 3

ten’s place

day alarm information coded in BCD

format

3to0

0to9

unit place

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