PCF8523 datasheet(9/66 Pages) NXP

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PCF8523

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Product data sheet

Rev. 3 — 30 March 2011

9 of 66

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.2.2 Register Control_2

[1]

Default value.

Table 6.

Control_2 - control and status register 2 (address 01h) bit description

Bit

Symbol

Value

Description

7WTAF

0[1]

no watchdog timer A interrupt generated

flag set when watchdog timer A interrupt

generated; flag is read-only and cleared by

reading register Control_2

6CTAF

0[1]

no countdown timer A interrupt generated

flag set when countdown timer A interrupt

generated; flag must be cleared to clear

interrupt

5CTBF

0[1]

no countdown timer B interrupt generated

flag set when countdown timer B interrupt

generated; flag must be cleared to clear

interrupt

4SF

0[1]

no second interrupt generated

flag set when second interrupt generated; flag

must be cleared to clear interrupt

3AF

0[1]

no alarm interrupt generated

flag set when alarm triggered; flag must be

cleared to clear interrupt

2WTAIE

0[1]

watchdog timer A interrupt is disabled

watchdog timer A interrupt is enabled

1CTAIE

0[1]

countdown timer A interrupt is disabled

countdown timer A interrupt is enabled

0CTBIE

0[1]

countdown timer B interrupt is disabled

countdown timer B interrupt is enabled

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