Clock operation

M41T0

14/22

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.

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

Address

Data

Function/range

BCD format

D7

D6

D5

D4

D3

D2

D1

D0

0

ST

10 seconds

Seconds

Seconds

00-59

1

OF

10 minutes

Minutes

Minutes

00-59

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.

CB

10 hours

Hours

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