Interrupt on Rising Edge at less than V logic high

[jecottrell]

Hello All,

I apologize for a request for some spoon feeding but I'm not even sure which terminology to search on.

I need to wake a 18F4620 on a rising edge at a V level less than the standard Logic High V. I understand that can be done with the CCP module but I'm not sure where to start.

Can someone point me in the right direction?

Thanks,

John

[ckielstra]

You don't do this with the CCP module but with a combination of the Comperator Voltage Reference Module (CVRM) and the Comparator Module (CM).

The CVRM allows you to select a reference voltage for the CM. Configure the CM to have the reference voltage on one of it's two input pins and connect your input signal to the other pin. When the supply voltage rises above the reference voltage the CM will trigger and wake the CPU.

[jecottrell]

Ahhhh......

That makes sense.... I'll see if I can get it going.

Thanks,

John