Clock operation

M41T66

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3.9

Initial power-on defaults

Upon application of power to the device, the register bits will initially power-on in the state

indicated in Table 5.

Table 5.

Initial power-on default values

Condition

ST

OF

OFIE

OUT

AFE

SQWE

RS3-1

RS0

Watchdog

1.

All other control bits power-up in an undetermined state.

01

0

1

0

1

0

1

0

Table 6.

Century bits examples

CB0

CB1

Leap year?

1.

Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by

100. The only exceptions are those years evenly divisible by 400 (the year 2000 was a leap year, year

2100 is not).

00

Yes

2000

0

1

No

2100

1

0

No

2200

1

1

No

2300