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 41 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.11.3 Timestamp registers
8.11.3.1 Register Timestp_ctl
8.11.3.2 Register Sec_timestp
Table 57. Timestp_ctl - timestamp control register (address 12h) 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 TSM TSOFF - 1_O_16_TIMESTP[4:0]
Reset
value
00 - XXXXX
Table 58. Timestp_ctl - timestamp control register (address 12h) 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 Description
7 TSM 0 in subsequent events without clearing the timestamp
flags, the last event is stored
1 in subsequent events without clearing the timestamp
flags, the first event is stored
6 TSOFF 0 timestamp function active
1 timestamp function disabled
5 - - unused
4 to 0 1_O_16_TIMESTP[4:0]
1
⁄
16
second timestamp information coded in BCD
format
Table 59. Sec_timestp - second timestamp register (address 13h) 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 - SECOND_TIMESTP (0 to 59)
Reset
value
- XXXXXXX
Table 60. Sec_timestp - second timestamp register (address 13h) 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 SECOND_TIMESTP 0 to 5 ten’s place second timestamp information coded in BCD format
3to0 0to9 unit place