PURPOSE:To decide whether an MPU operates normally or not by supplying instructions which are required for a test of the MPU sequentially from an input pattern memory and leading addresses and data which are outputted by the MPU corresponding to the instructions to a comparator. CONSTITUTION:The output of an address bus Ba after reset resetting is led to an address comparator 3a and compared here with an expected vector address value outputted from an output pattern memory 2 to decide a function for initializing respective elements. When an address parameter is inputted from an input pattern 1 to the MPU 10, the MPU 10 outputs the address of a RAM 12 which is indicated by the parameter to an address bus Ba. The comparator 3a compares this address with an expected address value pattern Ps to decide a function for correctly accessing the address of a ROM 11 or the RAM 12. Further, a data comparator 3d compares data which is outputted from a register with the expected value pattern Ps. Consequently, a function which performs specific operation can be decided.
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