I'm setting MODRR=3 to route CAN0 to PJ7/PJ6. I have tried various combinations of the other Port J configuration registers (e.g., DDRJ = 0x80 or 0x00, PERJ = 0x00 or 0xC3) I also have tried to ensure that the IIC is disabled (I think, by explicitly setting IBCR = 0).
Is there some special combination of configuration bits needed to make JP7-6 work? Are there known hardware problems with the function? (This is driving me nuts.)
Thanks for your help.