JPS5457847A - Microprogram control circuit - Google Patents

Microprogram control circuit

Info

Publication number
JPS5457847A
JPS5457847A JP12347377A JP12347377A JPS5457847A JP S5457847 A JPS5457847 A JP S5457847A JP 12347377 A JP12347377 A JP 12347377A JP 12347377 A JP12347377 A JP 12347377A JP S5457847 A JPS5457847 A JP S5457847A
Authority
JP
Japan
Prior art keywords
microinstruction
rom
define
control circuit
content
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
JP12347377A
Other languages
Japanese (ja)
Inventor
Noboru Yamaguchi
Yuzo Kita
Masaru Shibukawa
Kazuo Minorikawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12347377A priority Critical patent/JPS5457847A/en
Publication of JPS5457847A publication Critical patent/JPS5457847A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reduce the total number of bits of a ROM and the number of circuits of hardware logic accompanying it, by enabling the ROM to define a flag which is defined by a microinstruction.
CONSTITUTION: Corresponding to the content of microinstruction register 5, the address of microprogram counter 6 is determined, the microinstruction of ROM7 is read out, and vaious control signals are generated via decoder 8. At this time, reading the ROM depending upon the content of microinstruction register 5 enables ROM9 to define a flag special to the microinstruction, thereby making programs common
COPYRIGHT: (C)1979,JPO&Japio
JP12347377A 1977-10-17 1977-10-17 Microprogram control circuit Pending JPS5457847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12347377A JPS5457847A (en) 1977-10-17 1977-10-17 Microprogram control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12347377A JPS5457847A (en) 1977-10-17 1977-10-17 Microprogram control circuit

Publications (1)

Publication Number Publication Date
JPS5457847A true JPS5457847A (en) 1979-05-10

Family

ID=14861488

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12347377A Pending JPS5457847A (en) 1977-10-17 1977-10-17 Microprogram control circuit

Country Status (1)

Country Link
JP (1) JPS5457847A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5837744A (en) * 1981-08-28 1983-03-05 Hitachi Ltd Hardware controlling system for processor
JPS629438A (en) * 1985-07-05 1987-01-17 Matsushita Electric Ind Co Ltd Instruction decoding device
JPS62102333A (en) * 1985-10-29 1987-05-12 Fujitsu Ltd Microprogram control system
JPH0642980U (en) * 1992-11-25 1994-06-07 明郎 市川 Towel knitted fabric

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5837744A (en) * 1981-08-28 1983-03-05 Hitachi Ltd Hardware controlling system for processor
JPS629438A (en) * 1985-07-05 1987-01-17 Matsushita Electric Ind Co Ltd Instruction decoding device
JPS62102333A (en) * 1985-10-29 1987-05-12 Fujitsu Ltd Microprogram control system
JPH0642980U (en) * 1992-11-25 1994-06-07 明郎 市川 Towel knitted fabric

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