| 摘要 |
PURPOSE:To improve the executing efficiency by attaining the extension of an instruction system by a program of software and therefore constituting the instruction system in response to the request of the software. CONSTITUTION:A machine word instruction analyzing part 10 analyzes a machine instruction given through an input terminal A and outputs it to a machine word instruction executing part 20 for execution as long as the ana lyzed instruction is equal to an instruction excepting for a call instruction of a microinstruction. If the input machine instruction is equal to said call instruc tion, the information on a call function is outputted to an analysis mechanism for call of microinstruction procedure. The mechanism 30 outputs the correspond ing instruction procedure information to a microprocedure call mechanism 50 out of the information on the instruction procedure group held by the 1st memory 40 according to an input signal. The mechanism 50 calls and executed the corresponding instruction procedure out of the microinstruction procedure group held by the 2nd memory 60 based on the input signal. Thus an instruction system can be extended by a software program of the storage contents of both memories 40 and 60. |
