PCF2127 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2127' PDF : 101 Pages View PDF
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.10.3 Register Hour_alarm
Table 48. Hour_alarm - hour alarm register (address 0Ch) bit allocation
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
7
6
5
4
3
2
1
0
Symbol
AE_H
-
AMPM
HOUR_ALARM (1 to 12) in 12-hour mode
HOUR_ALARM (0 to 23) in 24-hour mode
Reset
1
-
X
X
X
X
X
X
value
Table 49. Hour_alarm - hour alarm register (address 0Ch) bit description
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
Symbol
Value
Place value Description
7
AE_H
0
-
hour alarm is enabled
1
-
hour alarm is disabled
6
-
-
-
unused
12-hour mode[1]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
3 to 0
HOUR_ALARM
0 to 1
0 to 9
ten’s place hour alarm information coded in BCD format when in
unit place 12-hour mode
24-hour mode[1]
5 to 4
3 to 0
HOUR_ALARM
0 to 2
0 to 9
ten’s place hour alarm information coded in BCD format when in
unit place 24-hour mode
[1] Hour mode is set by the bit 12_24 in register Control_1.
8.10.4 Register Day_alarm
Table 50. Day_alarm - day alarm register (address 0Dh) bit allocation
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
7
6
5
4
3
2
1
0
Symbol
AE_D
-
DAY_ALARM (1 to 31)
Reset
1
-
X
X
X
X
X
X
value
Table 51. Day_alarm - day alarm register (address 0Dh) bit description
Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and
unchanged by subsequent resets.
Bit
Symbol
Value
Place value Description
7
AE_D
0
-
day alarm is enabled
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
3 to 0
0 to 9
unit place
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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