RV-8523 Datasheet, PDF (41/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
Example of shortening the INT_1 pulse by clearing the CTAF flag:
RV-8523
The timing shown for clearing bit CTAF is also valid for the non-pulsed interrupt mode, that is, when TAM set
logic 0, where the INT_1 pulse may be shortened by setting CTAIE logic 0.
1) _{Indicates normal duration of INT_1 pulse.}
9.10. STOP BIT FUNCTION
The STOP bit function allows the accurate starting of the time circuits. The STOP bit function causes the upper part
of the prescaler (F₂ to F₁₄) to be held in reset and thus no 1 Hz ticks are generated. The time circuits can then be
set and do not increment until the STOP bit is released (see figure below).
STOP bit:
STOP does not affect the output of 32.768 kHz, 16.384 kHz or 8.192 kHz (see section 8.6.1.).
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