Datasheet

PCF8523 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6 — 17 September 2013 11 of 78
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.2.3 Register Control_3
[1] Default value is 111.
[2] Default value.
Table 9. Control_3 - control and status register 3 (address 02h) bit description
Bit Symbol Value Description
7 to 5 PM[2:0] see Table 11
[1]
battery switch-over and battery low detection
control
4 - - unused
3 BSF 0
[2]
no battery switch-over interrupt generated
1 flag set when battery switch-over occurs; flag
must be cleared to clear interrupt
2BLF 0
[2]
battery status ok
1 battery status low; flag is read-only
1 BSIE 0
[2]
no interrupt generated from battery switch-over
flag, BSF
1 interrupt generated when BSF is set
0BLIE 0
[2]
no interrupt generated from battery low
flag, BLF
1 interrupt generated when BLF is set