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PIC 50Hz square

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Actually this is wierd, I have been looking into interrupts over the weekend.

Something got me stumped and I was going to post a question - would you believe it one of the posts on this thread answered it!
 
It is possible to generate a step sine wave with a R2R resistor pack connected to portb of a PIC16F627 and it can be filtered with a R/C network to a perfect sine wave at precise 50Hz with the PIC running on IRCOC or a 4 MHz crystal
 
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