PCF8523 NXP [NXP Semiconductors], PCF8523 Datasheet - Page 24

• Manufacturer Part Number: PCF8523
• Description: Real-Time Clock (RTC) and calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8523
Product data sheet
8.7.3 Register Day_alarm
8.7.4 Register Weekday_alarm
8.7.5 Alarm flag
Table 22.
[1]
Table 23.
[1]
Bit
7
6
5 to 4
3 to 0
Bit
7
6 to 3
2 to 0
Fig 15. Alarm function block diagram
Default value.
Default value.
(1) Only when all enabled alarm settings are matching.
Symbol
AE_D
-
DAY_ALARM
Symbol
AE_W
-
WEEKDAY_ALARM
It’s only on increment to a matched case that the alarm flag is set, see
Day_alarm - day alarm register (address 0Ch) bit description
Weekday_alarm - weekday alarm register (address 0Dh) bit description
check now signal
All information provided in this document is subject to legal disclaimers.
WEEKDAY ALARM
MINUTE ALARM
WEEKDAY TIME
HOUR ALARM
MINUTE TIME
DAY ALARM
HOUR TIME
DAY TIME
Rev. 3 — 30 March 2011
Value
0
1
-
0 to 3
0 to 9
Value
0
1
-
0 to 6
[1]
[1]
=
=
=
=
AE_W
AE_M
AE_H
AE_D
Place value Description
-
-
-
ten’s place
unit place
Description
weekday alarm is enabled
weekday alarm is disabled
unused
weekday alarm information
Real-Time Clock (RTC) and calendar
set alarm flag AF
day alarm is enabled
day alarm is disabled
unused
day alarm information coded in
BCD format
AE_M = 1
example
013aaa088
Section
1
0
(1)
PCF8523
© NXP B.V. 2011. All rights reserved.
8.7.5.
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