Clock operation

M41T01

14/24

DocID025389 Rev 2

Note:

S = Sign bit

FT = Frequency test bit

ST = Stop bit

OUT = Output level

X = Don’t care

CEB = Century enable bit

CB = Century bit

Note:

1

When CEB is set to '1', CB will toggle 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 will not toggle.

Table 2. Register map

Addr

Data

Function/range

BCD format

D7

D6

D5

D4

D3

D2

D1

D0

0

ST

10 Seconds

Seconds

Seconds

00-59

1

X

10 Minutes

Minutes

Minutes

00-59

2

CB

10 Hours

Hours

Century/Hours 0-1/00-23

3

X

XXXX

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

FT

S

Calibration

Control