Comparator doubt

xxopiumxx · Joined: 01 Jul 2011 Posts: 20

Hi people, I am working in a project for timing the amount of time that takes a certain pin to go from 1 to 0. In order of do that I need to get an interrupt from the comparator in a high-to-low mode with the vref_low module set around 0.8v.
The problem is that I can't find the way of set the comparator in this high to low mode.

Does anyone know how to do this? or someone have a better way of getting what i need?

Thanks a lot and sorry for my horrible English.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

1. Post your PIC and compiler version.

2. Also, what type of signal is this ? Is it a sine wave ? What are the
high and low voltage levels of the waveform ? What's the frequency ?
If it's not a continous sinewave, then what's the shortest and the longest
risetime that you expect to get from the waveform ?