Dan Michaels email (remove spam text)
Mike Harrison wrote:
>>4) I realized I could use the OSC_OUT (At CLK/4) as a deglitch
>> clock for a BiPhase-L output that got added at the last minute!
>OSCOUT will be the same as the input frequency - it's only fosc/4 in
>It might be possible to get the PWM or compare output to run at Fosc -
By using the 2 LSBs of the 10-bit PWM, you can get pulses out that
are only a quarter cycle long. With a 20 Mhz xtal, I use this technique
to generate 50 nsec pulses at a 5Mhz rate. Since the PR2 register
is totally programmable, you are not locked into only a few
PWM frequencies. You would set PR2 = 00h, IIRC, to get this rate.
Can also get 100/175/... nsec:
-___-___ or --__--__ or ---_---_
50ns 100ns 175ns <-- pulse width
The center one will be 50% duty cycle at 5 Mhz even. You cannot get
the period < 200 nsec ~ 1/5Mhz for 20Mhz xtal.
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