| 摘要 |
PURPOSE:To attain a monitor system for runaway of a program with no oversight by comparing the comparison data which serves as the final address of an executing program set at a comparison value setting circuit with an address signal delivered from a microprocessor. CONSTITUTION:The execution is started at the head address AOS of an initializing program PO prior to an executing program P1. The final instruction OPE in the program PO sets the value of the final address AIE of the program P1 within a comparison value setting circuit 1 as the comparison data via a data bus DB and then executes the program P1. Hereafter the comparison data is compared with an address signal AB1 delivered from a microprocessor CPU by a comparator 2 up to the address AIE. If the signal AB1 is larger than the comparison data of the circuit 1, the output signal 21 of the comparator 2 is delivered at L. While the output signal G31 of an NOR gate G3 is set at H. Thus a program runaway is decided, and a latch circuit 4 is set. |
