PCF2129AT datasheet(27/68 Pages) NXP

27 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

27 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.9.1 Register Second_alarm

[1]

Default value.

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.

Table 25.

Second_alarm - second alarm register (address 0Ah) bit description

Bit

Symbol

Value

Place value Description

AE_S

second alarm is enabled

1[1]

second alarm is disabled

6 to 4 SECOND_ALARM

0 to 5

ten’s place

second alarm information coded in BCD

format

3to0

0to9

unit place

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

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