INSTRUCTION CANCEL DEVICE

摘要

PROBLEM TO BE SOLVED: To inhibit the execution of a processing even after an execution instruction is given by providing a function for invalidating the execution of only an instruction which becomes unnecessary during the execution instruction accumulated in a memory. SOLUTION: The execution instruction generated from a system control circuit 2 is sequentially accumulated in the FIFO memory 3 by a write control circuit 4. The execution instruction is read by a read control circuit 5 and is set in the respective circuits of a poststage. When a cancel signal from the system control circuit 2 is valid, the execution instruction is only read from the FIFO memory 3 and it is not set in anywhere.