PURPOSE: To utilize appropriate results of the A/D conversion in executing the job by storing the results of the A/D conversion for each basic DY; time in the memory of the address corresponding to the duplication of the interrup tion request of the job, and shifting them to the address corresponding to the order of generation of the previous interruption.

CONSTITUTION: When the store address of the results of the A/D conversion is not less than 32 but the FIFO buffer of the store address to be utilized in the 4ms job, the overlap counter OLC of the 4ms job is limited to 3 in the step S1105, and the results of A/D conversion to be loaded in the accumulator A are stored in the address to be added by the store address by doubling this overlap counter OLC in the step S1106. In executing the 4ms job, the data are read from the first word, and when the job is finished, the data of each word are sequentially shifted to the word in the first direction, and the results of the A/D conversion are read from the previously stored data through the FIFO buffer.