M41ST85WMH View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41ST85WMH

3.0/3.3V I²C combination serial RTC, NVRAM supervisor and microprocessor supervisor

STMicroelectronics 

Clock operation

M41ST85W

Table 2. TIMEKEEPER® register map

Data

Address

D7

D6

D5

D4

D3

D2

D1

D0

00h

0.1 Seconds

0.01 Seconds

01h

ST

10 Seconds

Seconds

02h

0

10 Minutes

Minutes

03h

CEB CB

10 Hours

Hours (24 Hour Format)

04h

TR

0

0

0

0

Day of Week

05h

0

0

10 Date

Date: Day of Month

06h

0

0

0

10M

Month

07h

10 Years

Year

08h

OUT FT

S

Calibration

09h

WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0

0Ah

AFE SQWE ABE Al 10M

Alarm Month

0Bh RPT4 RPT5 AI 10 Date

Alarm Date

0Ch RPT3 HT

AI 10 Hour

Alarm Hour

0Dh RPT2

Alarm 10 Minutes

Alarm Minutes

0Eh RPT1 Alarm 10 Seconds

Alarm Seconds

0Fh

WDF AF

0

BL

0

0

0

0

10h

0

0

0

0

0

0

0

0

11h

0

0

0

0

0

0

0

0

12h

0

0

0

0

0

0

0

0

13h

RS3 RS2 RS1 RS0

0

0

0

0

KEYS:

S = Sign Bit

FT = Frequency Test Bit

ST = Stop Bit

0 = Must be set to zero

BL = Battery Low Flag (Read only)

BMB0-BMB4 = Watchdog Multiplier Bits

CEB = Century Enable Bit

CB = Century Bit

OUT = Output level

AFE = Alarm Flag Enable Flag

RB0-RB1 = Watchdog Resolution Bits

WDS = Watchdog Steering Bit

ABE = Alarm in Battery Back-Up Mode Enable Bit

RPT1-RPT5 = Alarm Repeat Mode Bits

WDF = Watchdog flag (Read only)

AF = Alarm flag (Read only)

SQWE = Square Wave Enable

RS0-RS3 = SQW Frequency

HT = Halt Update Bit

TR = trec Bit

Function/range

BCD format

Seconds

Seconds

Minutes

Century/Hours

Day

Date

Month

Year

Control

Watchdog

Al Month

Al Date

Al Hour

Al Min

Al Sec

Flags

Reserved

Reserved

Reserved

SQW

00-99

00-59

00-59

0-1/00-23

01-7

01-31

01-12

00-99

01-12

01-31

00-23

00-59

00-59

20/41

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