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12F508 - interrupt on change

 
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shappy
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12F508 - interrupt on change
PostPosted: Sat Feb 27, 2010 5:59 am     Reply with quote
I have 12F508 which is generating 2 frequencies with different duty cycle. I have two inputs on pins GP4 and GP5. For the different configurations on inputs, I must output different frequency on the output. So I need a code how to set up interrupt routine on pin change (in this routine I will read the inputs and determine which frequency to generate).

Thank you !

Best regards,
Ivailo
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Feb 28, 2010 12:38 am     Reply with quote
Quote:

So I need a code how to set up interrupt routine on pin change (in this
routine I will read the inputs and determine which frequency to generate).

The 12F508 doesn't have any interrupts. Download the data sheet
and search for the word "interrupt". You won't find it.
http://ww1.microchip.com/downloads/en/DeviceDoc/41236E.pdf
So if you want to check those pins for user input, you will have
to poll them (i.e., read them at a periodic interval).
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