JPS54159104A - Communication control unit - Google Patents

Communication control unit

Info

Publication number
JPS54159104A
JPS54159104A JP6779278A JP6779278A JPS54159104A JP S54159104 A JPS54159104 A JP S54159104A JP 6779278 A JP6779278 A JP 6779278A JP 6779278 A JP6779278 A JP 6779278A JP S54159104 A JPS54159104 A JP S54159104A
Authority
JP
Japan
Prior art keywords
cpu
polling
automatic
transferred
instruction
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.)
Granted
Application number
JP6779278A
Other languages
Japanese (ja)
Other versions
JPS5826866B2 (en
Inventor
Takeshi Harakawa
Noboru Okazaki
Koichi Kunimasa
Nobuhiro Koyama
Toyokazu Hashimoto
Masahiko Tamaki
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 JP53067792A priority Critical patent/JPS5826866B2/en
Publication of JPS54159104A publication Critical patent/JPS54159104A/en
Publication of JPS5826866B2 publication Critical patent/JPS5826866B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/22—Handling requests for interconnection or transfer for access to input/output bus using successive scanning, e.g. polling

Abstract

PURPOSE:To increase the ability of processing by avoiding the interruption to CPU from the communication control unit, through the response transferred to CPU to be moved to the next polling and through the request of the next automatic instruction when the polling data is processed for a given length. CONSTITUTION:The automatic polling command register 3 performs temporal memory by receiving the automatic polling instruction from CPU, the automatic polling command control section 4 fetches the polling data from CPU every station while the automatic polling command is present in the register 3 and transfers it to each station via the transmission line 10. Further, the response from each station is fetched from the reception line 11, and if it is transferred to CPU, it is transferred to CPU and the automatic polling instruction is taken over to the read command. If it is not transferred to CPU, it is transferred to the polling of the next secondary station. When the polling data is processed for a given length, the next automatic instruction is requested. Thus, the interruption from the communication control unit to CPU is avoided to increase the ability for processing.
JP53067792A 1978-06-07 1978-06-07 Communication control device Expired JPS5826866B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53067792A JPS5826866B2 (en) 1978-06-07 1978-06-07 Communication control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53067792A JPS5826866B2 (en) 1978-06-07 1978-06-07 Communication control device

Publications (2)

Publication Number Publication Date
JPS54159104A true JPS54159104A (en) 1979-12-15
JPS5826866B2 JPS5826866B2 (en) 1983-06-06

Family

ID=13355146

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53067792A Expired JPS5826866B2 (en) 1978-06-07 1978-06-07 Communication control device

Country Status (1)

Country Link
JP (1) JPS5826866B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01140261U (en) * 1988-03-22 1989-09-26
JPH04117576U (en) * 1991-04-05 1992-10-21 ダイワ精工株式会社 fishing reel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831804A (en) * 1971-08-30 1973-04-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831804A (en) * 1971-08-30 1973-04-26

Also Published As

Publication number Publication date
JPS5826866B2 (en) 1983-06-06

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