PLL VCO error voltage resources on PIC

[fvnktion]

I am looking into a new project that requires the use of demodulating basic digital modulated signals such as Pulse width - position or manchester type of coding. I dont want to do all of the processing in the micro if at all possible. I would like to use hardware such as a PLL to lock on the pre defined frequencies of modulated pulses and then use the PIC to decode the demodulated signals.

I am wondering if there is any access to the built in PLLs of the PICs to do anything like this. Such as feeding a reference PWM signal to the PLL and reading the VCO error voltage to determing if there is a modulated signal?

If there is nothing available on the PICs what about some alternative hardware options?

Any ideas would be great.

Thanks

[fvnktion]

Another key comment to make is that I will need to be able to decode modulated signals outside of the standard 30 - 56khz, which have handy little IR receivers already all packaged up for use.