Content originally posted in LPCWare by madD7 on Thu Aug 08 21:09:06 MST 2013
Do you want the rising edge to be detected by the controller??
In that case you can connect the signal to any of the port 0 or port 2 pins as these pins work as interrupts and can detect and generate an interrupt during rising/falling/both edges.
The other way is if you are generating the PWM using the controller, enable the pwm interrupt and in the ISR, process the GPIO line as required.