| 摘要 |
PURPOSE:To attain advanced control after a mode change before end of arithmetic execution by providing mode flags in response to plural instruction buffers and changing these mode flags in the advanced control. CONSTITUTION:An instruction word is taken out to an instruction register 4 from the 1st instruction buffer 1 through a selector 3 to perform the advanced control. A request control circuit 30 refers to the output of the 1st mode flag 11 to control the requests. If an instruction decoder 20 decides that the instruction word taken out to the register 4 indicates the return of the control to a user program, an action mode control circuit 40 decides a mode and informs this mode to the circuit 30 and a mode flag 12. The circuit 30 refers to the flag 12 and extracts the instruction word to the user program to perform the advanced control of the user program.
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