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External Interrupt on GP2

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Suraj143

Active Member
I'm receiving a continuous 5V square wave pulse 50Hz. I want to detect High to low transition (Falling edge) on GP2.

My question is Do I need to enable internal WPU on GP2? I use PIC12F675.
 

Pommie

Well-Known Member
Most Helpful Member
If you use the IOC (Interrupt on change) function on GP2 then if, when the interrupt triggers, the pin is low it must have just transitioned. You need the WPU if the signal is active low only.

Mike.
 

Suraj143

Active Member
Hi,

I need to use INTF external interrupt flag bit.I set INTEDG to falling edge.In this case do I need the internal WPU enable?
 

Pommie

Well-Known Member
Most Helpful Member
If your signal is driven high then WPU not needed. If open collector then WPU needed. Either way you can enable WPU as it can't do any harm.

Mike.
 
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