PCF2123BS/1 NXP Semiconductors, PCF2123BS/1 Datasheet - Page 17

• Manufacturer Part Number: PCF2123BS/1
• Manufacturer: NXP Semiconductors

Specifications of PCF2123BS/1

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
8.5.1 Register Minute_alarm
8.5.2 Register Hour_alarm
8.5.3 Register Day_alarm
8.5 Alarm function
When one or more of these registers are loaded with a valid minute, hour, day, or
weekday and its corresponding alarm enable bit (AE_x) is logic 0, then that information
will be compared with the current minute, hour, day, and weekday.
Table 18.
[1]
Table 19.
[1]
[2]
Table 20.
[1]
Bit
7
6 to 4
3 to 0
Bit
7
6
12 hour mode
5
4
3 to 0
24 hour mode
5 to 4
3 to 0
Bit
7
6
5 to 4
3 to 0
Default value.
Default value.
Hour mode is set by the 12_24 bit in register Control_1.
Default value.
Symbol
AE_M
MINUTE_ALARM
Symbol
AE_H
-
AMPM
HOUR_ALARM
HOUR_ALARM
Symbol
AE_D
-
DAY_ALARM
Minute_alarm - minute alarm register (address 09h) bit description
Hour_alarm - hour alarm register (address 0Ah) bit description
Day_alarm - day alarm register (address 0Bh) bit description
[2]
[2]
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 April 2011
Value
0
1
0 to 5
0 to 9
Value
0
1
-
0
1
0 to 1
0 to 9
0 to 2
0 to 9
Value
0
1
-
0 to 3
0 to 9
[1]
[1]
[1]
Place value Description
-
-
ten’s place
unit place
Place value Description
-
-
-
-
-
ten’s place
unit place
ten’s place
unit place
Place value Description
-
-
-
ten’s place
unit place
minute alarm is enabled
minute alarm is disabled
minute alarm information coded in
BCD format
hour alarm is enabled
hour alarm is disabled
unused
indicates AM
indicates PM
hour alarm information coded in
BCD format when in 12 hour
mode
hour alarm information coded in
BCD format when in 24 hour
mode
day alarm is enabled
day alarm is disabled
unused
day alarm information coded in
BCD format
SPI Real time clock/calendar
PCF2123
© NXP B.V. 2011. All rights reserved.
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