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JPS54136244A - Input unit to computers and the like of information transmission unit - Google Patents

Input unit to computers and the like of information transmission unit

Info

Publication number
JPS54136244A
JPS54136244A JP4447578A JP4447578A JPS54136244A JP S54136244 A JPS54136244 A JP S54136244A JP 4447578 A JP4447578 A JP 4447578A JP 4447578 A JP4447578 A JP 4447578A JP S54136244 A JPS54136244 A JP S54136244A
Authority
JP
Japan
Prior art keywords
cpu
circuit
conditional change
change
word
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
JP4447578A
Other languages
Japanese (ja)
Inventor
Asao Yamanishi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4447578A priority Critical patent/JPS54136244A/en
Publication of JPS54136244A publication Critical patent/JPS54136244A/en
Pending legal-status Critical Current

Links

Landscapes

  • Small-Scale Networks (AREA)
  • Selective Calling Equipment (AREA)
  • Bus Control (AREA)

Abstract

PURPOSE: To obtain the input unit which can omit the periodic work for CPU and avoid the failure of other works, by detecting the conditional change of transmission data and informing the change present to CPU with interruption.
CONSTITUTION: The transmission signal is the parallel signal of one word unit through the demodulator 3 of the transmission unit 2 and the serial-parallel conversion circuit 4. The conditional change detection circuit 12, through the exclusive logical sum of word of the one period before corresponding in the word and the memory circuit 13, outputs to the signal line 18 if the conditional change is discovered. With the selection gate circuits 17a,17b,17c, when no output is on the signal line 18, the head address of the storage address production circuit 14 without conditional change is selected and delivered to the output circuit, and when output is present, the head address of the storage address production circuit 15 for conditional change is selected and delivered. Accordingly, only when conditional change is taken place, it is informed to CPU, allowing to make unnecessary the periodic work of CPU, and the occupying factor of CPU is decreased to avoid the delay in other works.
COPYRIGHT: (C)1979,JPO&Japio
JP4447578A 1978-04-14 1978-04-14 Input unit to computers and the like of information transmission unit Pending JPS54136244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4447578A JPS54136244A (en) 1978-04-14 1978-04-14 Input unit to computers and the like of information transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4447578A JPS54136244A (en) 1978-04-14 1978-04-14 Input unit to computers and the like of information transmission unit

Publications (1)

Publication Number Publication Date
JPS54136244A true JPS54136244A (en) 1979-10-23

Family

ID=12692542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4447578A Pending JPS54136244A (en) 1978-04-14 1978-04-14 Input unit to computers and the like of information transmission unit

Country Status (1)

Country Link
JP (1) JPS54136244A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129455A (en) * 1980-03-17 1981-10-09 Hitachi Ltd Remote monitor and control device
JPS5818740A (en) * 1981-07-28 1983-02-03 Toshiba Corp Data transmitting device
JPS58120344A (en) * 1982-01-11 1983-07-18 Sumitomo Electric Ind Ltd Information exchange circuit
JPH05183412A (en) * 1991-12-27 1993-07-23 Nec Corp Digital control signal switching device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129455A (en) * 1980-03-17 1981-10-09 Hitachi Ltd Remote monitor and control device
JPS5818740A (en) * 1981-07-28 1983-02-03 Toshiba Corp Data transmitting device
JPS58120344A (en) * 1982-01-11 1983-07-18 Sumitomo Electric Ind Ltd Information exchange circuit
JPH05183412A (en) * 1991-12-27 1993-07-23 Nec Corp Digital control signal switching device

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