Microprocessor having a debug interruption function

摘要

In a microprocessor having a debug module and a JTAG unit based on the JTAG standards, there is provided a vector switching circuit in the CPU core which can switch a debug interruption vector address to a user space or to a system space. This vector switching circuit switches a debug interruption vector address depending upon the state of a debug module specified by a command inputted from external hardware such as an emulator via the JTAG interface. A user program can easily be debugged by allocating the debug program in the user space even if hardware such as an emulator is not connected to the microprocessor.