JPS5549751A - Microprogram control unit - Google Patents

Microprogram control unit

Info

Publication number
JPS5549751A
JPS5549751A JP12224478A JP12224478A JPS5549751A JP S5549751 A JPS5549751 A JP S5549751A JP 12224478 A JP12224478 A JP 12224478A JP 12224478 A JP12224478 A JP 12224478A JP S5549751 A JPS5549751 A JP S5549751A
Authority
JP
Japan
Prior art keywords
instruction
main memory
microprogram
specific
counter
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
JP12224478A
Other languages
Japanese (ja)
Inventor
Yoichi Umemura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12224478A priority Critical patent/JPS5549751A/en
Publication of JPS5549751A publication Critical patent/JPS5549751A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent an overhead caused by a store operation by storing only a specific routine contributing to system performance improvement into a control storage unit.
CONSTITUTION: A specific instruction is read from main memory 1 and accesses auxiliary control memory 9 and reads a start address of microprogram in main memory 4. Instruction words from the main memory are sent to microprogram substitute decision circuit 15 and are stored into register 16. The instruction is decoded in decoder 17, and adds 1 to counter 18 or 19 depending on the result. When the counter is overflowed within a fixed time, operation part 6 is interrupted to store a microprogram corresponding to the specific instruction to be executed into main memory 4. A routine corresponding to the specific instruction is stored if this instruction is executed over a prescrived frequency.
COPYRIGHT: (C)1980,JPO&Japio
JP12224478A 1978-10-03 1978-10-03 Microprogram control unit Pending JPS5549751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12224478A JPS5549751A (en) 1978-10-03 1978-10-03 Microprogram control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12224478A JPS5549751A (en) 1978-10-03 1978-10-03 Microprogram control unit

Publications (1)

Publication Number Publication Date
JPS5549751A true JPS5549751A (en) 1980-04-10

Family

ID=14831151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12224478A Pending JPS5549751A (en) 1978-10-03 1978-10-03 Microprogram control unit

Country Status (1)

Country Link
JP (1) JPS5549751A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981693A (en) * 1982-10-30 1984-05-11 日本精機株式会社 Field light emitting display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981693A (en) * 1982-10-30 1984-05-11 日本精機株式会社 Field light emitting display
JPH037116B2 (en) * 1982-10-30 1991-01-31 Japan Engine Valve Mfg

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