RV-8564 Datasheet, PDF (21/40 Pages) MICORO CRYSTAL SWITZERLAND – I2C-Bus Interface Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8564
9.5. STOP BIT FUNCTION
The function of the STOP bit is to allow an accurate starting of the time circuits. The STOP bit function will cause
the upper part of the prescaler to (F₂ to F₁₄) to be held in reset and thus no 1 Hz ticks will be generated. The time
circuits can then be set and will not increment until the STOP bit is released.
OSCILLATOR
1 Hz
STOP
The STOP bit function will not affect the 32.768 kHz output on CLKOUT, but will stop the generation of 1024 Hz,
32 Hz and 1 Hz.
The lower two stages of the prescaler (F₀ and F₁) are not reset and as the I²C bus is asynchronous to the crystal
oscillator, the accuracy of re-starting the time circuits will be between zero and one 8192 Hz cycle.
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