M41T83RM6F datasheet(45/64 Pages) STMICROELECTRONICS

Part #	M41T83RM6F

Description	Serial I2C bus real-time clock (RTC) with battery switchover

PDF	64 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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45 / 64 page

DocID012578 Rev 19

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M41T82, M41T83

Clock operation

Figure 25. IRQ1/FT/OUT output pin circuit

The timer, oscillator fail detect circuit, alarm 1, and watchdog are ORed together as the

primary interrupt sources. The frequency test signal, FT, is used to enable a 512 Hz output

on the IRQ1/FT/OUT pin for calibrating the RTC. When not used as an interrupt or

frequency test output, the pin can be used as a discrete logic output controlled by the OUT

bit. The ABE bit is used to enable interrupts during backup mode.

Operating on VCC, all four interrupt sources are available. During backup, the timer and

watchdog are disabled, and the only interrupt sources are alarm 1 and the oscillator fail

detect circuit.

TIMER

OFIE

AI1E

WDOG

PRE

reload

AF1

WDF

OUT

A1IE

OFIE

TIE

w-dog running

ABE

IRQ1/OUT/FT

Write OF to 0

to clear

Read FLAGS register

to clear

Write watchdog register

to clear

IRQ1/OUT/FT

LOGIC

TI/TP

TIE

AM03013v1

M41T83RM6F Datasheet(PDF) 45 Page - STMicroelectronics