JPS5647842A - Microprogram control system - Google Patents

Microprogram control system

Info

Publication number
JPS5647842A
JPS5647842A JP12421579A JP12421579A JPS5647842A JP S5647842 A JPS5647842 A JP S5647842A JP 12421579 A JP12421579 A JP 12421579A JP 12421579 A JP12421579 A JP 12421579A JP S5647842 A JPS5647842 A JP S5647842A
Authority
JP
Japan
Prior art keywords
microprogram
microinstruction
start address
control system
derives
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12421579A
Other languages
Japanese (ja)
Inventor
Masao Suga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12421579A priority Critical patent/JPS5647842A/en
Publication of JPS5647842A publication Critical patent/JPS5647842A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To elevate a speed of processing, by performing the operation in parallel as to the operation which sets a microinstruction to the instruction register, and the operation which derives a start address of the above microprogram.
CONSTITUTION: A microinstruction from the main memory is set to the instruction register 30 through the data bus 29. When an interruption occurs, a code (for example, FF) which does not exist in the corresponding OP code is forcibly selected as an input of the mapping ROM34 by an offering signal 50, and a start address of the microprogram is set to the microprogram counter 35. Thus, the operation which sets a microinstruction to the register and that which derives a start address of the microprogram can be performed in parallel, and a speed of processing can be elevated.
COPYRIGHT: (C)1981,JPO&Japio
JP12421579A 1979-09-28 1979-09-28 Microprogram control system Pending JPS5647842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12421579A JPS5647842A (en) 1979-09-28 1979-09-28 Microprogram control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12421579A JPS5647842A (en) 1979-09-28 1979-09-28 Microprogram control system

Publications (1)

Publication Number Publication Date
JPS5647842A true JPS5647842A (en) 1981-04-30

Family

ID=14879835

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12421579A Pending JPS5647842A (en) 1979-09-28 1979-09-28 Microprogram control system

Country Status (1)

Country Link
JP (1) JPS5647842A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0333929A (en) * 1989-03-10 1991-02-14 Nec Corp Microprogram controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0333929A (en) * 1989-03-10 1991-02-14 Nec Corp Microprogram controller

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