PC8523-1(2012) 查看數據表（PDF） - NXP Semiconductors.

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PC8523-1
(Rev.:2012)

Real-Time Clock (RTC) and calendar

NXP Semiconductors. 

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.7.3 Register Day_alarm

Table 24. Day_alarm - day alarm register (address 0Ch) bit description

Bit

Symbol

Value

Place value Description

7

AE_D

0

-

day alarm is enabled

1[1]

-

day alarm is disabled

6

-

-

-

unused

5 to 4 DAY_ALARM

3 to 0

0 to 3

0 to 9

ten’s place day alarm information coded in

unit place BCD format

[1] Default value.

8.7.4 Register Weekday_alarm

Table 25. Weekday_alarm - weekday alarm register (address 0Dh) bit description

Bit

Symbol

Value

Description

7

AE_W

0

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

[1] Default value.

8.7.5 Alarm flag

check now signal

MINUTE ALARM

=

MINUTE TIME

HOUR ALARM

=

HOUR TIME

DAY ALARM

=

DAY TIME

AE_M

AE_H

AE_D

example

AE_M = 1

1

0

set alarm flag AF (1)

WEEKDAY ALARM

=

WEEKDAY TIME

AE_W

013aaa088

(1) Only when all enabled alarm settings are matching.

It is only on increment to a matched case that the alarm flag is set, see Section 8.7.5.

Fig 15. Alarm function block diagram

PCF8523

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 4 — 5 July 2012

© NXP B.V. 2012. All rights reserved.

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