| 摘要 |
PURPOSE:To earlier discover an error occurring in a microprogram controller by providing a display function to inform the execution of the instruction in order to detect the run-away. CONSTITUTION:When a program 6 is stored into a control memory device 2A, a hexadecimal FF is buried to the unused area. When the instruction code and hexadecimal FF buried to the unused area are executed by some reason, coincident conditions occur in an instruction comparator 4, and the output 5 of the instruction comparator 4 is generated. The output 5 is inputted to an indicator 7, informed to an operator and simultaneously, the program to execute an abnormal processing stored from a hexadecimal 38 address is started. As the indicator 7, a light emitting diode, a buzzer, etc., are suitable. |
