Datasheet

Clock operation M41T0
14/23 Doc ID 9105 Rev 7
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)
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
2CEB
(2)
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