Datasheet

PCF2127AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6 — 11 July 2013 46 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
8.12.4 Dependency between Battery switch-over and timestamp
The timestamp function depends on the control bit BTSE in register Control_3:
[1] Default value.
Table 53. Battery switch-over and timestamp
BTSE BF Description
0-
[1]
the battery switch-over does not affect the timestamp registers
1 If a battery switch-over event occurs:
0
[1]
the timestamp registers store the time and date when the switch-over occurs;
after this event occurred BF is set logic 1
1 the timestamp registers are not modified;
in this condition subsequent battery switch-over events or falling edges on pin
TS are not registered