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
8.9.3 Register Hours
Table 32. Hours - hours register (address 05h) 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
-
-
AMPM
HOURS (1 to 12) in 12-hour mode
HOURS (0 to 23) in 24-hour mode
Reset
-
-
X
X
X
X
X
X
value
Table 33. Hours - hours register (address 05h) 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 to 6
-
-
-
unused
12-hour mode[1]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
3 to 0
HOURS
0 to 1
0 to 9
ten’s place actual hours coded in BCD format when in 12-hour
unit place mode
24-hour mode[1]
5 to 4
3 to 0
HOURS
0 to 2
0 to 9
ten’s place actual hours coded in BCD format when in 24-hour
unit place mode
[1] Hour mode is set by the bit 12_24 in register Control_1 (see Table 7).
8.9.4 Register Days
Table 34. Days - days register (address 06h) 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
-
-
DAYS (1 to 31)
Reset
-
-
X
X
X
X
X
X
value
Table 35.
Bit
7 to 6
5 to 4
3 to 0
Days - days register (address 06h) bit description
Symbol
Value
Place value Description
-
-
-
unused
DAYS[1]
0 to 3
ten’s place actual day coded in BCD format
0 to 9
unit place
[1] If the year counter contains a value which is exactly divisible by 4, including the year 00, the RTC compensates for leap years by adding
a 29th day to February.
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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