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I have read datasheet of pic16f877a.They say global interrupt bit is automatically blocked(GIE=0) when have interupts occur.but I noticed that when people write programs,the first thing is disable_in ...

I thank you for your interest. I use 220/380v AC voltage with 50HZ Frequency. I use to adjust the brightness of the street lamps (halogen lamps). I use RB interupts of pic16f877a (RB5,RB6,RB7) for det ...

I use Zero crossing detect circuit to detect zero point of source voltage. If single phase then I can do it, I have used interrupt timer to create time delay to trigger triac. But with three phase the ...