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How to interpret a TTL signal with 16F887?
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calamaro



Joined: 08 Oct 2009
Posts: 2
Post04 Nov 2009 15:48   

How to interpret a TTL signal with 16F887?
Hi to all, I have a 16F887 pic and I have connected at pin RA4 a TTL signal like in attached picture. How can I write a function that recognise the time of a low or high signal transmitted? If the signal is (low or high) for 256µs I have to put into an array 0 otherwise if the signal is 512µs I have to put into an array 1. Like in the picture the time measure of signal must be from low to high of the square wave.

Thanks to all for your help

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hameeds01



Joined: 23 Aug 2005
Posts: 308
Helped: 15
Location: NUST Islamabad
Post04 Nov 2009 16:36   

Re: How to interpret a TTL signal with 16F887?
u can use Capture Pulse Width from CCP Register
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calamaro



Joined: 08 Oct 2009
Posts: 2
Post04 Nov 2009 19:25   

Re: How to interpret a TTL signal with 16F887?
hameeds01 wrote:
u can use Capture Pulse Width from CCP Register


I've never used CCP Module, could you post an example please?
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