INFORMATION PROCESSOR

PURPOSE:To prevent the stop of an electric power from occurring from a power source device when a central processing unit is in the non-stop condition by detecting the condition of the central processing unit and deciding and controlling the propriety of the power-off of the power switch of the power source device. CONSTITUTION:Even when a central processing unit is in the non-stop condition and a power switch 5 is turned off, a condition detecting circuit 7 detects that the power-off impossible condition is obtained, the current to a relay coil 6a continues to flow, a relay, switch 6b is held at the on condition, and therefore, the power source device continues the action. Thereafter, when the central processing unit is in the stop condition, the condition detecting circuit 7 detects that the power-off impossible condition is obtained, the current to the relay coil 6a is stopped, the relay switch 6b is in the off condition and the power source device stops the action. Thus, the interruption of the processing during the program execution due to carelessness and a misoperation is prevented and the adverse influence is not given to an external memory.