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 33 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
8.9.1 Register Second_alarm
8.9.2 Register Minute_alarm
Table 38. Second_alarm - second alarm register (address 0Ah) bit allocation
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_S SECOND_ALARM (0 to 59)
Reset
value
1XXXXXXX
Table 39. Second_alarm - second alarm register (address 0Ah) bit description
Bit Symbol Value Place value Description
7 AE_S 0 - second alarm is enabled
1 - second alarm is disabled
6 to 4 SECOND_ALARM 0 to 5 ten’s place second alarm information coded in BCD format
3to0 0to9 unit place
Table 40. Minute_alarm - minute alarm register (address 0Bh) bit allocation
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_M MINUTE_ALARM (0 to 59)
Reset
value
1XXXXXXX
Table 41. Minute_alarm - minute alarm register (address 0Bh) bit description
Bits labeled as X are undefined at power-on and unchanged by subsequent resets.
Bit Symbol Value Place value Description
7 AE_M 0 - minute alarm is enabled
1 - minute alarm is disabled
6 to 4 MINUTE_ALARM 0 to 5 ten’s place minute alarm information coded in BCD format
3to0 0to9 unit place