| 摘要 |
PURPOSE:To reduce a checking time and the man power and also to improve the reliability of checking results, by providing a history memory circuit, a history memory control circuit, etc. for tracking of execution of each instruction. CONSTITUTION:The history information showing whether each instruction is actually executed is recorded to a history memory circuit 8 by a career memory control circuit 6. In other words, the address of an instruction that is read out of a program memory 2 and executed by a microprocessor MPU1 is recorded to the circuit 8 in an execution mode. When the execution of a program is over, then tracked and checked. In this case, the execution mode is switched to a read mode to read out the address out of the memory 2. Then the execution of the program is tracked and checked by the history information corresponding to the read-out address. In such a way, the history information is checked via circuits 6 and 8, etc., and reduces the checking time and the man power in tracking and check of programs, and also improves the reliability of checking results. |
