PIC18F4550 at 48Mhz

[andromeda92]

Hi,

How i configure #FUSES for 48Mhz ?

I have tested all possibility but it don't work

i have a crystal 16Mz

[Ttelmah]

You need to use CPUDIV1.

The CPUDIV fuses are slightly complicated.

There are four divisor patterns.

00 01 10 11

When running off the crystal directly, these give /1, /2, /3 & /4

These are called by CCS CPUDIV1, CPUDIV2, CPUDIV3 & CPUDIV4.

However, when fed from the PLL, these same patterns give /2, /3, /4 & /6.

Personally I wish that CCS called them CPUDIV00, CPUDIV01, CPUDIV10 & CPUDIV11, with a note to look in the data sheet for what division ratio these actually give....

If your crystal is 16MHzx, you need to use PLL4. You have to be dividing the crystal down to 4MHz to feed the PLL.

So:

[andromeda92]

Thanks for your explication.