Datasheet

PCF2127AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6 — 11 July 2013 35 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
8.10.2 Register Minute_alarm
[1] Default value.
8.10.3 Register Hour_alarm
[1] Default value.
[2] Hour mode is set by the bit 12_24 in register Control_1.
8.10.4 Register Day_alarm
[1] Default value.
Table 31. Minute_alarm - minute alarm register (address 0Bh) 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 0 to 5 ten’s place minute alarm information coded in BCD
format
3to0 0to9 unit place
Table 32. Hour_alarm - hour alarm register (address 0Ch) 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 0 to 1 ten’s place hour alarm information coded in BCD
format when in 12 hour mode
3to0 0to9 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
3to0 0to9 unit place
Table 33. Day_alarm - day alarm register (address 0Dh) 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 0 to 3 ten’s place day alarm information coded in BCD
format
3to0 0to9 unit place