| 摘要 |
PURPOSE:To make confirmation of the current and last values of a program counter possible and to make the grasp of executed condition of a program easy when the program counter is updated, by updating the program counter after its content is saved to a stacking area. CONSTITUTION:When a program counter 5 which performs operation processing, etc., by successively reading out executing procedures from a memory 14, is updated, the updating operation is made after the content of the counter 5 is saved to a stacking area 14a. Therefore, the present and last values of the program counter 5 can be confirmed and the executed condition of a program can be grasped easily. Moreover, simplification of the debug, trace, etc., of a program become possible.
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