Pull Up enabled and PWM question

[financecatalyst]

Hi

Q.1)- I would like to know what help does this "weak pull up enabled" does and what it actually means. I have a receiver and a transmitter which I have made myself using RF Modules. I press one button on transmitter and corresponding code is transmitted and receiver activates the corresponding triac (BT136 through MOC3021). CAN THIS WEAK PULL UP be useful in my code (if yes, will it be useful at receiver end or transmitter end or both)? I am using 12F635. I am holding Tx PIC pins ground so as to avoid unwanted transmission by floating pins.

Q.2)- I also want to control the speed of my fan, I read the microchips document using 12F508 but as it is in C I can't understand it fully. Does anyone has a PBPro program for it. I want to control speed of fan and two on/off operations with my Rx PIC and use 4 buttons on transmitter ( 2 for high/low and rest of the two for on/off operation.

Thanks

P.s: I tried using pwm command using 16F690 to dim a light bulb (Yes, it didn't worked). I am back to 12F635 and try your advice now.