I believe it is stated that the PIC18F452-I/P does not have a oscillator of any kind which does seem stupid but that is how it is worded. They do not say that it does not have a crystal. None of the micro controllers have a crystal but most of them have a tank circuit to time the instruction cycles, correct? The way it is worded ,the PIC18F452-I/P does not have a oscillator of any kind so the timer 'counter' has nothing to count unless a external one is added. Here's link to google books that spits it right out.https://books.google.com/books?id=rH1_DwAAQBAJ&pg=PA29&lpg=PA29&dq=PIC18FXX2+clock+speed&source=bl&ots=Rb4LSFn45p&sig=ACfU3U3Djv8yTY17fxGSmW6N4m8nlSHSKA&hl=en&ppis=_e&sa=X&ved=2ahUKEwjZ57O17pznAhWrdN8KHQMoBvUQ6AEwAnoECAoQAQ#v=onepage&q=PIC18FXX2%20clock%20speed&f=false
Edit: Also the PIC18F4520 states in the specs that it does have a internal oscillator while the PIC18F452 does not state this.
Edit: Also the PIC18F4520 states in the specs that it does have a internal oscillator while the PIC18F452 does not state this.
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