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 26 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.8.2 Register Minutes
Table 23. Seconds coded in BCD format
Seconds
value in
decimal
Upper-digit (ten’s place) Digit (unit place)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
000000000
010000001
020000010
::::::::
090001001
100010000
::::::::
581011000
591011001
Table 24. Minutes - minutes register (address 04h) 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 - MINUTES (0 to 59)
Reset
value
- XXXXXXX
Table 25. Minutes - minutes register (address 04h) 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 MINUTES 0 to 5 ten’s place actual minutes coded in BCD format
3to0 0to9 unit place