RV-8523 Datasheet, PDF (39/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
Example for second interrupt when TAM = 1:
RV-8523
In this example, bit TAM is set logic 1 and SF flag is not cleared after an interrupt.
Example for second interrupt when TAM = 0:
In this example, bit TAM is set logic 0 and SF flag is cleared after an interrupt.
9.9.4.TIMER INTERRUPT PULSE
The timer interrupt is generated as a pulsed signal when TAM or TBM are set logic 1. The pulse generator for the
timer interrupt also uses an internal clock, but this time it is dependent on the selected source clock for the timer
and on the timer register value n. So, the width of the interrupt pulse varies; see tables below.
Interrupt low pulse width for timer A (pulse mode, bit TAM set logic 1):
Source clock (Hz)
Interrupt pulse width
n = 1¹⁾
4096
122 µs
64
7.812 ms
1
1_/60
1_/3600
15.625 ms
15.625 ms
15.625 ms
1) _{n = loaded timer register value. Timer stops when n = 0.}
n > 1¹⁾
244 µs
15.625 ms
15.625 ms
15.625 ms
15.625 ms
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