Electronics4you
Member
Hi All,
Searching in the datasheet (PIC18FXX2) for workable crystals I found this peace of text: "A Phase Locked Loop circuit is provided as a programmable option for users that want to multiply the frequency
of the incoming crystal oscillator signal by 4. For an input clock frequency of 10 MHz, the internal clock frequency will be multiplied to 40 MHz. This is
useful for customers who are concerned with EMI due to high frequency crystals." Does it mean, that I can connect a 10 MHz crystal to the PIC and then get a 4 times higher work frequency? Seem a little strange to me, because normally it's 1/4 the frecuency. Any comments to that?
What's tha maximum fecuency it can work with?
Searching in the datasheet (PIC18FXX2) for workable crystals I found this peace of text: "A Phase Locked Loop circuit is provided as a programmable option for users that want to multiply the frequency
of the incoming crystal oscillator signal by 4. For an input clock frequency of 10 MHz, the internal clock frequency will be multiplied to 40 MHz. This is
useful for customers who are concerned with EMI due to high frequency crystals." Does it mean, that I can connect a 10 MHz crystal to the PIC and then get a 4 times higher work frequency? Seem a little strange to me, because normally it's 1/4 the frecuency. Any comments to that?
What's tha maximum fecuency it can work with?