BDM Debug System Based on S12 Micro Controller Unit

By researching Background Debug Mode(BDM) interface,this paper designs and realizes a debug system based on S12 serial Micro Controller Unit(MCU) which adopts USB2.0 interface to communicate PC with programmable debugger.It designs the functions of updating real-time value of registers,memory and variables,which help users to seek the location and find the mistakes in an efficient and intuitive way. It implements the breakpoint setting function,and offers efficient sentence-by-sentence debug and process-by-process debug for programs with different sequence structures.