| 摘要 |
PURPOSE:To grasp accurately the date, when program runaway occurs and to analyze easily causes of program runaway by providing a program runaway detecting circuit. CONSTITUTION:A CPU1 continues to transmit runaway detection clear pulses to a runaway detecting circuit 7 in the normal state. If this clear pulse signal is broken, runaway of the CPU1 is detected, and a reset signal is transmitted to the CPU1, and a runaway detection signal is outputted for a certain period. When the CPU1 is reset, an initial routine is executed; and if the runaway detection signal is outputted in this case, the date of this output is read out from a calendar IC5 and is written in a prescribed storage area of a non-volatile RAM6. Meanwhile, the runaway detecting circuit 7 clears the runaway detection signal when several detection clear pulses are inputted thereafter. |
