Runaway detecting method

Abstract

Abstract PURPOSE:To restore automatically to an initial state when the executing cycle goes to abnormal by setting a step to a synchronizing program to be reset to an initial program when the difference between the present value of a timer and the memory value exceeds the limit level larger than the fixed value. CONSTITUTION:A timer which counts the time in terms of hardware is provided together with a memory which adds the fixed value that decides the executing cycle to the previous storage value every time a main program is started and stores them again. In a detecting method for runaway of a microcomputer system which decides the start conditions of the main program by a synchronizing program when the difference between the present value of the timer and the value of the memory exceeds a fixed level, a step is set to the synchronizing program to be reset to an initial program when the difference between the timer present value and the memory value exceeds the limit level larger than the fixed value. Thus it is possible to detect the program runaways which are repeated in a cycle shorter than a prescribed cycle without changing nor adding the hard constitution. Then the system can be reset automatically.

Inventors

• 👤 Hideo Watanabe
• 👤 秀夫 渡辺

Bibliographic Details