INSTRUCTION EXECUTION PROCESSING SYSTEM

PURPOSE:To omit a subroutine by preparing a route which uses the contents of a table as the operand data on an instruction and replacing the partial contents of the instruction with the contents of a data table. CONSTITUTION:In a mormal mode the contents (data) read out of a data table 6 are supplied to a data application part via a gate 8. While these contents (data) are set to an operand data register 9 in an operand mode. Then the partial contents of the instruction read out of a program ROM 10 and set to an instruction register 12 are replaced with the contents of the register 9. Thus the partial contents of the register 12 are substantially changed and supplied to an instruction decoding part.