18f2550 USB OSC Problem

[serkanc]

I have programmed my 18f2550 bootload.hex which I have compiled with c18. I can send hex files with PDFSUSB. I'm using microcode studio.. I have no problems with any code except OSC settings... I have defined OSC as 48 MHZ at the beginning of program, but it's faster than that.. I put pause 1000, but it pauses 0.25 second...
I tried to change config settings for the bootloader hex, but so i have got problems with PDFSUSB... So i think there is a solution with OSC setting..
I need someone to help me...

[bcd]

How bizarre - I was loading the same code into a 18f2550 only yesterday !
Did you change the CONFIG registers in your code as these control the actual OSC speed.

You need to have OSC48 in the code as this is the internal rate the PIC runs at - you set the PLL frequency based on your crystal speed.

Let me fire up the laptop and get the CONFIGs I used for 4MHz and 20MHz which I know work with my breadboard circuit.

bill.

[mister_e]

Yup, post your C18 pragma line and we will be able to help. seems to me that the CPUDIV is wrong... well i think...

[serkanc]

Thanks for help.. But I only use c18 for bootload hex. I'm using PBP with microcode studio for my software...
I didn't change lines.. PDFSUSB works fine.. I'm using 20 MHZ Crystal with 15pf capacitor...
I wrote DEFINE OSC 48 but it's faster.. It causes also problems on serial comm with another PICs...
I think config bits are normal...
#pragma config PLLDIV = 5 // (20 MHz input)
#pragma config CPUDIV = OSC1_PLL2
#pragma config USBDIV = 2 // Clock source from 96MHz PLL/2
#pragma config FOSC = HSPLL_HS

[mister_e]

Your program speed will relly on the config fuse setting of your bootloader, if they are false, your program won't work as expected... that's for sure. You can still alter the config fuse at run time.

They seems to be great.. at least to me... hummm...

[serkanc]

I wil check again everything i done.. Possibble i made a mistakeee