PC8523-1(2012) 查看數據表（PDF） - NXP Semiconductors.
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PC8523-1 Datasheet PDF : 74 Pages
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NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
Because of this method, it is very important to make a read or write access in one go, that
is, setting or reading seconds through to years should be made in one single access.
Failing to comply with this method could result in the time becoming corrupted.
As an example, if the time (seconds through to hours) is set in one access and then in a
second access the date is set, it is possible that the time will increment between the two
accesses. A similar problem exists when reading. A rollover may occur between reads
thus giving the minutes from one moment and the hours from the next.
8.7 Alarm registers
The registers at addresses 0Ah through 0Dh contain the alarm information.
8.7.1 Register Minute_alarm
Table 22. Minute_alarm - minute alarm register (address 0Ah) bit description
Bit
Symbol
Value
Place value Description
7
AE_M
0
-
minute alarm is enabled
1[1]
-
minute alarm is disabled
6 to 4 MINUTE_ALARM
3 to 0
0 to 5
0 to 9
ten’s place minute alarm information coded in
unit place BCD format
[1] Default value.
8.7.2 Register Hour_alarm
Table 23. Hour_alarm - hour alarm register (address 0Bh) bit description
Bit
Symbol
Value
Place value Description
7
AE_H
0
-
hour alarm is enabled
1[1]
-
hour alarm is disabled
6
-
-
-
unused
12 hour mode[2]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
HOUR_ALARM
3 to 0
0 to 1
0 to 9
ten’s place hour alarm information in 12 hour
unit place mode coded in BCD format
24 hour mode[2]
5 to 4 HOURS
3 to 0
0 to 2
0 to 9
ten’s place hour alarm information in 24 hour
unit place mode coded in BCD format
[1] Default value.
[2] Hour mode is set by bit 12_24 in register Control_1 (see Table 7).
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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