I am confused about how to set the internal oscillator for the PIC 18F4431. I would like to use the chip's internal oscillator and run it at its fastest speed but I am not sure how to do this. The OSC configuration bits and the OSCCON register are not clear to me. I am not sure what OSC = HS implies. Also, according to the datasheet, the fastest speed that OSCCON can be set to is 8 MHz but I read that the 18F4431 can run at 40 MHz. Please help! Thank you!