PCF8523T datasheet(11/75 Pages) NXP

Part #	PCF8523T

Description	Real-Time Clock (RTC) and calendar

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Manufacturer	NXP [NXP Semiconductors]

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PCF8523

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Product data sheet

Rev. 4 — 5 July 2012

11 of 74

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

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