I have a software that is now stable for years on C167CR and I wanted to port it to C167CS to add a 2nd CAN controller. If in the Start167.A66 I add only the line MOV XPERCON,#0401H then the software is not working anymore (looks like if there were no interrupt anymore !). This line is added before XPEN is set to 1. I have double checked the XPERCON register when running OK, and it is set to 0401H ! So, what's wrong ? Does the writing in XPERCON change something else ? Is there anybody to help me to understand that ?