M41T0(2008) データシートの表示（PDF） - STMicroelectronics

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M41T0
(Rev.:2008)

Serial real-time clock

STMicroelectronics 

Clock operation

M41T0

3.3

Initial power-on defaults

Upon initial application of power to the device, the OUT bit and OF bit will be set to a '1,'

while the ST bit will be set to '0.' All other register bits will initially power-on in a random

state.

Table 3. Register map(1)

Data

Address

D7 D6 D5 D4 D3 D2 D1 D0

Function/range

BCD format

0

ST

10 seconds

Seconds

Seconds

00-59

1

OF

10 minutes

2

CEB (2) CB 10 hours

Minutes

Hours

Minutes

00-59

Century/hours 0-1/00-23

3

X

X

X

X

X

Day

Day

01-07

4

X

X

10 date

Date

Date

01-31

5

X

X X 10 M.

Month

Month

01-12

6

10 years

Years

Year

00-99

7

OUT 0

X

X

X

X

X

X

Control

1. Keys:

ST = STOP bit

OUT = Output level

X = Don’t care

0 = Must be set to '0.'

CEB = Century enable bit

CB = Century bit

OF = Oscillator fail bit

2. When CEB is set to '1', CB toggles from '0' to '1' or from '1' to '0' at the turn of the century (dependent upon

the initial value set). When CEB is set to '0', CB does not toggle.

14/22

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