Hi, I use an XC164CM controller (on a Infineon Evalboard). My problem is, thats not possible to start an extern interrupt (EX4IN) on Portpin P9.2. The register values are correct for the simulation with µVision3. Probably I have a hardware problem. The positive trigger edge is from a 74LS00. But the controller can't detect the edge and no interrupt is started. Some ideas? Kindly regards Rainer