Frequency

Cenlasoft

Hello,
I was told that I cannot produce a 1 mhz square wave on a BSII. I have the sx28 kit and I was wondering if I could produce a 1 mhz square wave with it using a 50 mhz resonator? Would I used PWM? Any samples would help (circuit and code).
Thanks,
Curtis

Bean

Assuming you want a continuous 1MHz output use this (you can use any pin I just used RA.0):

DEVICE SX28,OSCHS2,TURBO,OPTIONX,STACKX
FREQ 50_000_000, 34_000_000
 
OutPin  PIN RA.0 OUTPUT
 
INTERRUPT NOCODE 2_000_000
  OutPin = ~OutPin
RETURNINT
 
PROGRAM Start
 
Start:
END

Just make the interrupt rate twice the desired frequency.

Note that since this is done in the interrupt, you can have other code running at the same time.

Bean

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Post Edited (Bean (Hitt Consulting)) : 11/25/2008 6:30:09 PM GMT

Cenlasoft

Thanks,
It looks easy.
Curtis