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David-embedded wrote:
>Dan Michaels wrote:
>>
>> Mike Harrison wrote:
>>
>> >>With 10Mhz xtal, you can get 2.500 Mhz down to 600 hz - it obviously
>> >>scales by xtal value. Frequency selections are a little "grainy"
>> >>on the high end - 2.5, 1.25, .8333, .625, .500, .4166, .357, .275,
>> >>.250, etc. However, rock-steady pulse generation.
>>
>> >If by 'rock steady' you mean zero jitter, you can do this using timer
>> >interrupts, with Fosc/4 resolution.
>> >
>>
>> By rock-steady, I meant it is generated in h.w., and once set,
>> doesn't even burp when any other s.w. is running. Just try generating
>> a 1 Mhz square-wave in s.w. simultaneous with RS-232 comms.
>
>If the extra hardware is not too much, maybe an external phase locked
>loop circuit would be in order.
>


Extra h.w. is probably ok for some. Am enclosing the PLL ckt
Jinx sent me offlist - I imagine he won't mind -[am sure it
came out of a book anyways - say what, J ???].

Another 1-chip solution came to mind. A Scenix running at 50
Mhz could probably handle a "finely-tuned" VP [virtual peripheral]
that could both generate two square-waves to 1 Mhz and also perform
RS-232 simultaneously, without burping the square-waves.

- danM

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