DATA PROCESSOR

PURPOSE:To enable a control part to control directly an input/output port with no intervention of an executing unit, by providing newly an input/output port which is controlled directly by the control signal delivered from a micro- ROM into a microprocessor. CONSTITUTION:A microinstruction is stored...

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Bibliographic Details
Main Author KIHARA TOSHIMASA
Format Patent
LanguageEnglish
Published 16.05.1986
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:PURPOSE:To enable a control part to control directly an input/output port with no intervention of an executing unit, by providing newly an input/output port which is controlled directly by the control signal delivered from a micro- ROM into a microprocessor. CONSTITUTION:A microinstruction is stored in a micro-ROM11 for each address. The contents of an instruction register 12 are decoded by an address decoder 13 when a macroinstruction read out of a memory 5 is fetched by an instruction register 12 via a data bus 3. Then an access is given to the corresponding address in the ROM11, and a microinstruction is read out. The macroinstruction fetched by the register 12 is executed by reading out plural microinstructions out of the ROM11. Then the following microinstructions are read out successive ly according to the next address written to the next address field of the microinstruction given from the ROM11.
Bibliography:Application Number: JP19840218479