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 12 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
8.2.3 Register Control_3
[1] Values see Table 18.
[2] Default value.
Table 8. Control_3 - control and status register 3 (address 02h) bit description
Bit Symbol Value Description Reference
7 to 5 PWRMNG[2:0]
[1]
control of the battery switch-over, battery low
detection, and extra power fail detection
functions
Section 8.6
4BTSE 0
[2]
no timestamp when battery switch-over
occurs
Section 8.12.4
1 time-stamped when battery switch-over
occurs
3BF 0
[2]
no battery switch-over interrupt generated Section 8.6.1
1 flag set when battery switch-over occurs;
flag must be cleared to clear interrupt
2BLF 0
[2]
battery status ok;
no battery low interrupt generated
Section 8.6.3
1 battery status low;
flag cannot be cleared by command
1BIE 0
[2]
no interrupt generated from the battery flag
(BF)
Section 8.13.7
1 interrupt generated when BF is set
0BLIE 0
[2]
no interrupt generated from battery low flag
(BLF)
Section 8.13.8
1 interrupt generated when BLF is set