PCF2123TS datasheet(17/55 Pages) NXP

17 / 55 page

PCF2123_2

Product data sheet

Rev. 02 — 4 December 2009

17 of 55

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

9.7.2 Register Hour_alarm

[1]

Default value.

[2]

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

9.7.3 Register Day_alarm

[1]

Default value.

9.7.4 Register Weekday_alarm

[1]

Default value.

9.7.5 Alarm ﬂag

By clearing the MSB, AE_x (Alarm Enable), of one or more of the alarm registers the

corresponding alarm condition(s) are active. When an alarm occurs, AF (register

Control_2, see Table 6) is set logic 1. The asserted AF can be used to generate an

interrupt (INT). The AF is cleared using the interface.

Table 19.

Hour_alarm - hour alarm register (address 0Ah) 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

3 to 0

0 to 9

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

3 to 0

0 to 9

unit place

Table 20.

Day_alarm - day alarm register (address 0Bh) 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

3 to 0

0 to 9

unit place

Table 21.

Weekday_alarm - weekday alarm register (address 0Ch) bit description

Bit

Symbol

Value

Description

AE_W

weekday alarm is enabled

1[1]

weekday alarm is disabled

6 to 3 -

unused

2 to 0 WEEKDAY_ALARM 0 to 6

weekday alarm information coded in BCD format

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