M41T93 datasheet(39/56 Pages) STMICROELECTRONICS

Teilenummer	M41T93

Bauteilbeschribung	Serial SPI bus real-time clock (RTC) with battery switchover

PDF	56 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

39 / 56 page

DocID12615 Rev 8

39/56

M41T93

Clock operation

Figure 19 shows the various signal sources and controlling bits for the IRQ/FT/OUT output

pin.

Figure 19. IRQ/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 IRQ/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

IRQ/OUT/FT

Write OF to 0

to clear

Read FLAGS register

to clear

Write watchdog register

to clear

IRQ/OUT/FT

LOGIC

TI/TP

TIE

AM03013v1

M41T93 Datenblatt(PDF) 39 Page - STMicroelectronics

M41T93 Datenblatt(HTML) 39 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Datenblatt Download

Link URL