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code for counting the positive edges of a square wave

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sjjm

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Greetings
Im kindly and desperately looking for a code to count the pulses from a square wave using a pic 16f872. i want these pulses to be the basis of varying the turn on time of a heater connected to the pic and switcing being done by a triac driver and triac.
 

Use external interrupt pin, RB0 for doing that.

Regards
 

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