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PBP USB full speed crystal

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tgq

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Hi
I try to use HID example with 18F2455 but i'm confused about clock settings
What crystal to use with Pbp hid example default clock options ?
Thx
 

i think you can set it up to 24Mhz for sure check the application note since this chip very new
 

i read from microlabengineering website the pic18f2455 usb only work on PBP 2.46
 

useless response :(
i've tried 20MHz crystal and it works fine, full speed USB :)
 

I tried another exams. 18f4550, cdc, mouse, jademo .. with 20Mhz xtal. but Full speed mode works only with usb2.0 hardware.

If you want to use with usb 1.1 compatible hw. pic should works at 24Mhz (20Mhz xtall), and fuses must set correctly as mentioned *.txt which in usb18 folder (pbp2.46).
 

for pic18f24xx/18f44xx maximum xtal is 48Mhz usb 2.0 full speed 12mbps
pic16c745/16c645 max 24mhz usb 1.1 low speed 1.5mbps
 

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