Nexus is the interface available on the MPC5500 family for full application development and debug. There have been multiple revisions to the Nexus standard but the MPC5500 family has the Nexus Class 3 implementation. Key features of the Nexus class 3 standard are: flexible breakpoint and watch point set-up providing greater flexibility during debug, full duplex communication, non-intrusive program trace which helps speed up the debug, read and write access to memory locations while the CPU is running, and full data tracing during debug.