JPS57201940A - Assignment system for memory digit - Google Patents

Abstract

PURPOSE:To improve the efficiency of program genration and that of the processing of a processor by enabling a processor to directly process arithmetic which requires digit assignment for data in a memory device by machine word instructions of the processor. CONSTITUTION:When data 23 having <=22 word length necessary for program processing is read out of a memory 21 by direct digit assignment, a processor 24 operates a direct digit assigning circuit 25 which discriminates direct digit assigning processing from an instruction operation part for machine word instructions. The circuit 25 is so connected that data from the memory device 21 is inputted directly, and assigned data with one-word length is read out of the memory device 21 and set in the buffer register 26 in the circuit 25. The processor 24 transfers only the assigned necessary data from the buffer register 26 to a register r2. Similarly, writing to the memory device 21 by direct digit assignment and arithmetic such as comparison and addition are carried out through the operation of the direct digit assigning circuit 25.