| 摘要 |
<p>PURPOSE:To constitute one chip multi-microcomputer simply on the semiconductor integrated circuit, by selecting a plurality sets of program status, enabling to execute a plurality of programs in the instruction memory. CONSTITUTION:A plurality sets of program status PS1A, 1B respectively containing the stack pointer indicating the stack address, program counter indicating the address of executive instruction, internal flag including the operation flag in the control system and exclusive use register including the address register of the data memory 6, are provided. Further, the instruction memory 2 storing the progtam, instruction decoder 4 producing the control signal from the instruction word, data memory 6, arithmetic logical operation section 7, input and output circuit 8, internal data bus 9, PS selection circuit 10, and PS selection control circuit 11, are provided and one chip microcomputer is constituted so that control program is alternately executed by one instruction with the circuits 11 and 10 for PS1A, 1B.</p> |
