How to monitor external PWM signal using DSPIC w/o hard int?

[vaia-riseng]

Hi! I would really appreciate some help in monitoring an external PWM signal using DSPIC30f4011 without using hard interrupts. I need to monitor the pin whether it is still receiving a PWM signal from an external source. I can't think of a way to do this without hard interrupt. O_O Please help.

Also, I have a timer-based interrupt running on background so I want to ask if I can execute a delay_ms(...) command in a while loop in my main function without compromising the performance of the timer-based interrupt.

Thanks very much!