PURPOSE: To allow a service processor to release automatically without the intervention of an operator, and to save labor, by bringing processing for writing arithmetic results in a time setting register and control for restarting itself a certain time later under program control.

CONSTITUTION: A service processor 1 is provided with a processing unit 2 for the service processor and a self-loading function part 3 and when the function part 3 is actuated, a stop signal, a clear signal, and a load signal are sent to the unit 2. The processing unit 2 stops itself on receiving the stop signal, clears a storage device and a register on receiving the clear signal, and loads a program on receiving the load signal. According to the program of the processor 1, the current time of the timepiece 5 of a real timer 4 is read out and written in a time setting register 6, whose contents are compared with those of the timepiece 5 by a comparing circuit 7. When the comparison results shows coincidence, a loading start signal is sent to the processor 1 to actuate the function part 3.