RV-8564 datasheet(22/40 Pages) MICROCRYSTAL

22 / 40 page

Micro Crystal

Real Time Clock / Calendar Module

RV-8564

22/40

9.5.1.FIRST INCREMENT OF TIME CIRCUITS AFTER STOP BIT RELEASE

Bit

Prescaler bits

1 Hz Tick

Time

Comment

STOP

F0F1-F2 to F14

hh:mm:ss

Clock is running normally

01-0 0001 1101 0100

12:45:12

Prescaler counting normally

STOP bit is activated by user. F0 and F1 are not reset and values cannot be predicted externally

XX-0 0000 0000 0000

12:45:12

Prescaler is reset; time circuits are frozen

New time is set by user

XX-0 0000 0000 0000

08:00:00

Prescaler is reset; time circuits are frozen

STOP bit is released by user

XX-0 0000 0000 0000

08:00:00

Prescaler is now running

XX-1 0000 0000 0000

08:00:00

XX-0 1000 0000 0000

08:00:00

XX-1 1000 0000 0000

08:00:00

11-1 1111 1111 1110

08:00:00

00-0 0000 0000 0001

08:00:01

0 to 1 transition of F14 increments the time circuits

10-0 0000 0000 0001

08:00:01

11-1 1111 1111 1111

08:00:01

00-0 0000 0000 0000

08:00:01

10-0 0000 0000 0000

08:00:01

11-1 1111 1111 1110

08:00:01

00-0 0000 0000 0001

08:00:02

0 to 1 transition of F14 increments the time circuits

1) F

0 is clocked at 32.768 kHz.

The first increment of the time circuits is between 0.507813 s and 0.507935 s after STOP bit is released. The

uncertainty is caused by the prescaler bits F0 and F1 not being reset and the unknown state of the 32.768 kHz

clock.

9.6. RESET

The RV-8564 includes an internal reset circuit which is active whenever the oscillator is stopped. In the reset state,

the I

2C bus logic is initialized including the address pointer and all registers are set according to 8.7. I2C bus

communication is not possible during reset.

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