NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.2.3 Register Control_3
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
2
BLF
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
0
BLIE
0[2]
no interrupt generated from battery low
flag, BLF
1
interrupt generated when BLF is set
[1] Default value is 111.
[2] Default value.
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 28 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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