Hello
i use PIC18f452 and want to work with all features.as you know micro divide the input frequency to lower frequency for example if we put a 4Mhz crystal it works with 1Mhz.today i see something new in the 18f452 datasheet
"HS/PLL"
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.
Hello
i use PIC18f452 and want to work with all features.as you know micro divide the input frequency to lower frequency for example if we put a 4Mhz crystal it works with 1Mhz.today i see something new in the 18f452 datasheet
"HS/PLL"
it means if i put a 2Mhz crystal micro can use 4mhz and doesn't divide to 4?
but are you sure you make a complete Power-up Cycle???
The PLL doesn't work right after programming the fuses... You need to turn power off.. and then turn power on...