Microcomputer

Abstract

Abstract PURPOSE:To easily check whether an instruction is correctly carried out or not by using a means which initializes the temporary registers related to execution of instruction at the prescribed value at every execution of instructions. CONSTITUTION:An instruction decoding part 4 reads out an instruction to decode it and designates an address of a memory part 2. A general-purpose register part 3 designates an A register to read it out to an internal bus line 5. A temporary register 11 stores temporarily the contents of the A register. Then the part 2 reads out the memory contents to the line 5 and stores them temporarily in a temporary register 12. A logical arithmetic circuit 10 carries out an arithmetic operation, e.g., the addition and stores the result of this operation in a temporary register 14. Then a buffer 13 is turned on for output of the contents of the register 14 to the line 5. Thus the arithmetic operation is through and the registers 11, 12 and 14 are cleared by a clear signal 30. In such a way, the reading defect of the A register can be easily detected and deleted.

Inventors

• 👤 Yoshitaka Kitada

Bibliographic Details