M41ST87W datasheet(30/54 Pages) STMICROELECTRONICS

30 / 54 page

Clock operation

M41ST87W

30/54

DocID9497 Rev 11

Addr

Data

Function/range

BCD format

15h

TEB2

TIE2

TCM2

TPM2

TDS2

TCHI/

TCLO2 CLR2EXT CLR2 Tamper2

16h-

1Dh

ROM

Serial number

8-byte

1Eh-

1Fh

Reserved

2-byte

20h-

9Fh

128 user bytes

Keys:

0 = Must be set to zero

RB0-RB1 = Watchdog resolution bits

32kE = 32 kHz output enable bit

RPT1-RPT5 = Alarm repeat mode bits

ABE = Alarm in battery backup mode enable bit

RS0-RS3 = SQW frequency

AF = Alarm flag (read only)

S = Sign bit

AFE = Alarm flag enable bit

SQWE = Square wave enable

BL = Battery low flag (read only)

SQWOD = Square wave open drain bit

BMB0-BMB4 = Watchdog multiplier bits

ST = Stop bit

CB0-CB1 = Century bits

TB (1 and 2) = Tamper bits (read only)

CLR (1 and 2) = RAM clear bits

TCHI/

TCLO(1and2)=Tampercurrenthi/tamper

current low bits

CLR (1 and 2)EXT = RAM clear external bits

TCM (1 and 2) = Tamper connect mode bits

CLRPW0 = RAM clear pulse width 0 bit

TDS (1 and 2) = Tamper detect sampling bits

CLRPW1 = RAM clear pulse width 1 bit

TEB (1 and 2) = Tamper enable bits

FT = Frequency test bit

THS = Threshold bit

HT = Halt update bit

TIE (1 and 2) = Tamper interrupt enable bits

OF = Oscillator fail bit

TPM (1 and 2) = Tamper polarity mode bits

OFIE = Oscillator fail interrupt enable bit

TR = trec bit

OUT = Output level

WDS = Watchdog steering bit

PFOD = Power-fail output open drain bit

WDF = Watchdog flag (read only)

M41ST87W 数据表(PDF) 30 Page - STMicroelectronics

M41ST87W 数据表(HTML) 30 Page - STMicroelectronics

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