Datasheet
PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 19 December 2014 42 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.11.3.3 Register Min_timestp
8.11.3.4 Register Hour_timestp
[1] Hour mode is set by the bit 12_24 in register Control_1.
Table 61. Min_timestp - minute timestamp register (address 14h) 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 - MINUTE_TIMESTP (0 to 59)
Reset
value
- XXXXXXX
Table 62. Min_timestp - minute timestamp register (address 14h) 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- --unused
6 to 4 MINUTE_TIMESTP 0 to 5 ten’s place minute timestamp information coded in BCD format
3to0 0to9 unit place
Table 63. Hour_timestp - hour timestamp register (address 15h) 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 HOUR_TIMESTP (1 to 12) in 12-hour mode
HOUR_TIMESTP (0 to 23) in 24-hour mode
Reset
value
- - XXXXXX
Table 64. Hour_timestp - hour timestamp register (address 15h) 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
7to6 - - - unused
12-hour mode
[1]
5 AMPM 0 - indicates AM
1 - indicates PM
4 HOUR_TIMESTP 0 to 1 ten’s place hour timestamp information coded in BCD format
when in 12-hour mode
3to0 0to9 unit place
24-hour mode
[1]
5 to 4 HOUR_TIMESTP 0 to 2 ten’s place hour timestamp information coded in BCD format
when in 24-hour mode
3to0 0to9 unit place