20MHz problem on PIC18LF452

[Jerom]

Hello,

I have some problems starting my oscillator at 20MHz on the PIC18LF452, it
is programed in HS mode and it works fine with a 4MHz or a 10MHz xstal but
when I pulg in the 20MHz osclilator it won't start. I get 2.3V at OSC2 but
no clock (just DC) I tried with some different capacitors (15pF, 27pF and
33pF) all worked with the 4 and 10MHz xtal but none with the 20MHz...

anybody knows what coulld be wrong?

thanks,
Jerom

PS: another small question... what is the max speed on the I2C bus with a
PIC?

 

[Jerom]

just normal 5V

What's the Vdd you use?


Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
PICmicro chips, programmers, consulting

 

[Jerom]

Thanks,
I'm not able to program 'in circuit' but I'll keep that in mind
We can try the PLL setting... but that will be something for monday... no
school during the weekend :d

greets,
Jerom