M41T64(2004) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41T64
(Rev.:2004)

Serial Access Real-Time Clock with Alarms

STMicroelectronics 

M41T62/63/64/65

Table 6. M41T65 Register Map

Addr

D7

D6

D5

D4

00h

0.1 Seconds

01h

ST

02h OFIE

03h

0

04h

0

05h

0

10 Seconds

10 Minutes

0

10 Hours

0

0

0

0

10 Date

06h CB1

CB0

0

10M

07h

10 Years

08h OUT

FT

S

09h RB2 BMB4 BMB3 BMB2

0Ah AFE

0

0

Al 10M

0Bh RPT4 RPT5

AI 10 Date

0Ch RPT3

0

AI 10 Hour

0Dh RPT2

Alarm 10 Minutes

0Eh RPT1

Alarm 10 Seconds

0Fh WDF

AF

0

0

Keys: 0 = Must be set to '0'

AF = Alarm Flag (Read only)

AFE = Alarm Flag Enable Flag

BMB0 - BMB4 = Watchdog Multiplier Bits

CB0-CB1 = Century Bits

FT = Frequency Test Bit

OF = Oscillator Fail Bit

Function/Range BCD

D3

D2

D1

D0

Format

0.01 Seconds

10ths/100ths

of Seconds

00-99

Seconds

Seconds

00-59

Minutes

Minutes

00-59

Hours (24 Hour Format)

Hours

00-23

0

Day of Week

Day

01-7

Date: Day of Month

Date

01-31

Month

Century/

Month

0-3/01-12

Year

Year

00-99

Calibration

Calibration

BMB1 BMB0 RB1

RB0 Watchdog

Alarm Month

Al Month

01-12

Alarm Date

Al Date

01-31

Alarm Hour

Al Hour

00-23

Alarm Minutes

Al Min

00-59

Alarm Seconds

Al Sec

00-59

0

OF

0

0

Flags

OFIE = Oscillator Fail Interrupt Enable Bit

OUT = Output level

RB0 - RB2 = Watchdog Resolution Bits

RPT1-RPT5 = Alarm Repeat Mode Bits

S = Sign Bit

ST = Stop Bit

WDF = Watchdog Flag Bit (Read only)

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