PCF2129AT datasheet(10/68 Pages) NXP

10 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

10 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.2.3 Register Control_3

[1]

Values see Table 13.

[2]

Default value.

Table 7.

Control_3 - control and status register 3 (address 0Fh) 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 8.5

4BTSE

[2]

no timestamp when battery switch-over

occurs

Section 8.11.4

time-stamped when battery switch-over

occurs

3BF

[2]

no battery switch-over interrupt generated

Section 8.5.1

flag set when battery switch-over occurs;

flag must be cleared to clear interrupt

2BLF

[2]

battery status ok;

no battery low interrupt generated

Section 8.5.3

battery status low;

flag cannot be cleared using the interface

1BIE

[2]

no interrupt generated from the battery

flag (BF)

Section 8.12.6

interrupt generated when BF is set

0BLIE

[2]

no interrupt generated from battery low

flag (BLF)

Section 8.12.7

interrupt generated when BLF is set

PCF2129AT 数据表(PDF) 10 Page - NXP Semiconductors

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