I pretty much always use the internal clock on a Pic. I need accuracy on my latest project so I intend to use an external crystal.
What is the best way to validate that my Pic is running at the expected clock speed? I see that this Pic can output the clock on RB0. Is a possible way to use my scope on that pin to verify the clock?
I am a little confused on the PLL feature. The datasheet says:
The PIC18F47J13 Family has additional prescalers and
postscalers, which have been added to accommodate a
wide range of oscillator frequencies. The PIC18F47J13
provides two PLL circuits: a 4x multiplier PLL and a
96 MHz PLL enabling 48 MHz operation from the 8 MHz
internal oscillator. Figure 3-1 provides an overview of the
oscillator structure.
Does this mean if I use this feature, my actual clock will be 4X whatever crystal that I select? Is there a limit on the frequency of crystal can be used?
What is the best way to validate that my Pic is running at the expected clock speed? I see that this Pic can output the clock on RB0. Is a possible way to use my scope on that pin to verify the clock?
I am a little confused on the PLL feature. The datasheet says:
The PIC18F47J13 Family has additional prescalers and
postscalers, which have been added to accommodate a
wide range of oscillator frequencies. The PIC18F47J13
provides two PLL circuits: a 4x multiplier PLL and a
96 MHz PLL enabling 48 MHz operation from the 8 MHz
internal oscillator. Figure 3-1 provides an overview of the
oscillator structure.
Does this mean if I use this feature, my actual clock will be 4X whatever crystal that I select? Is there a limit on the frequency of crystal can be used?
