PCF2129AT datasheet(37/68 Pages) NXP

37 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

37 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.12 Interrupt output, INT

PCF2129A has an interrupt output pin INT which is open-drain, active LOW. Interrupts

may be sourced from different places:

• second or minute timer

• watchdog timer

• alarm

• timestamp

• battery switch-over

• battery low detection

When SI, MI, WD_CD, AIE, TSIE, BIE, BLIE are all disabled, INT will remain high-impedance.

Fig 19. Interrupt block diagram

BLF: BATTERY

LOW FLAG

SET

set battery

low flag, BLF

to interface:

read BLF

BLIE

001aaj399

from battery

low detection

circuit: clear BF

CLEAR

BF: BATTERY

FLAG

SET

set battery

flag, BF

to interface:

read BF

BIE

from interface:

clear BF

CLEAR

TSFx: TIMESTAMP

FLAG

SET

set timestamp

flag, TSFx

to interface:

read TSFx

TSIE

from interface:

clear TSF

CLEAR

AF: ALARM

FLAG

SET

set alarm

flag, AF

to interface:

read AF

AIE

from interface:

clear AF

CLEAR

WDTF:

WATCHDOG

TIMER FLAG

SET

WATCHDOG

COUNTER

to interface:

read WD_CD

WD_CD = 0

WD_CD = 1

MCU loading

watchdog counter

CLEAR

INT pin

MSF:

MINUTE

SECOND FLAG

SET

MINUTES COUNTER

SECONDS COUNTER

to interface:

read MSF

SI/MI

TI_TP

from interface:

clear MSF

CLEAR

PULSE

GENERATOR 1

TRIGGER

CLEAR

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