JPS56159723A - Clock switching control system - Google Patents

Clock switching control system

Info

Publication number
JPS56159723A
JPS56159723A JP6311080A JP6311080A JPS56159723A JP S56159723 A JPS56159723 A JP S56159723A JP 6311080 A JP6311080 A JP 6311080A JP 6311080 A JP6311080 A JP 6311080A JP S56159723 A JPS56159723 A JP S56159723A
Authority
JP
Japan
Prior art keywords
outputs
clock
output
effective
circuit
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
JP6311080A
Other languages
Japanese (ja)
Other versions
JPS648369B2 (en
Inventor
Toshio Tanahashi
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 JP6311080A priority Critical patent/JPS56159723A/en
Publication of JPS56159723A publication Critical patent/JPS56159723A/en
Publication of JPS648369B2 publication Critical patent/JPS648369B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/04—Generating or distributing clock signals or signals derived directly therefrom

Abstract

PURPOSE:To switch clock source without depending upon a difference in period among clock outputs, by invalidating outputs of all synchronizing circuits in switching and by validating inputs of the synchronizing circuits after stopping the clcoks. CONSTITUTION:A selecting circuit 5-1 connected to switching signal terminals 7-1-7-m specifying the clock output of an optional clock generating source outputs an effective signal to one of outputs 8-1-8-n and ineffective outputs to other outputs. The outputs 8-1-8-n of the selecting circuit 5-1 are connected to gate circuits 2-1-2-n, which receive information from the output of a syncrhonizing circuit connecting with a clock output of a clock generating source other than one selected when the output of the gate circuit is effective and, when one of outputs of the synchronizing circuits is effective, invalidate and output the input of the selecting circuit.
JP6311080A 1980-05-12 1980-05-12 Clock switching control system Granted JPS56159723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6311080A JPS56159723A (en) 1980-05-12 1980-05-12 Clock switching control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6311080A JPS56159723A (en) 1980-05-12 1980-05-12 Clock switching control system

Publications (2)

Publication Number Publication Date
JPS56159723A true JPS56159723A (en) 1981-12-09
JPS648369B2 JPS648369B2 (en) 1989-02-14

Family

ID=13219817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6311080A Granted JPS56159723A (en) 1980-05-12 1980-05-12 Clock switching control system

Country Status (1)

Country Link
JP (1) JPS56159723A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605499A (en) * 1983-06-23 1985-01-12 Fujitsu Ltd Resetting system of register file
JPS6399931U (en) * 1986-12-16 1988-06-29

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605499A (en) * 1983-06-23 1985-01-12 Fujitsu Ltd Resetting system of register file
JPH0474799B2 (en) * 1983-06-23 1992-11-27
JPS6399931U (en) * 1986-12-16 1988-06-29

Also Published As

Publication number Publication date
JPS648369B2 (en) 1989-02-14

Similar Documents

Publication Publication Date Title
JPS56159723A (en) Clock switching control system
GB1508073A (en) Switching system
JPS5725734A (en) Party call receiver
JPS554178A (en) Information control system
JPS5760584A (en) Memory circuit
JPS52147052A (en) Analogue input signal switching unit
JPS57103175A (en) Automatic music selector
JPS56114441A (en) Counting circuit
JPS57108925A (en) Switch input circuit
JPS53138250A (en) Output buffer circuit
JPS56137422A (en) Input and output controlling system
JPS5381057A (en) Phase control system of synchronous oscillating circuit
JPS56140600A (en) Reader for read-only memory
JPS57109029A (en) Input system
JPS53102639A (en) Control card
JPS5696287A (en) Digital system battery clock
JPS57203320A (en) Sequence deciding circuit
FR2433263A1 (en) Control circuit for flip=flop - has inverter with two NOR circuits, OR circuits and flip=flop using time signal (BE 8.2.80)
JPS52128004A (en) Magnetic input type jumper checking circuit
JPS5769433A (en) Clock signal controlling system
JPS5340177A (en) Input and output control system in remote supervising control system
JPS5796287A (en) Electronic watch with forecasting function
JPS57108911A (en) Clock signal control system
JPS57125877A (en) Electronic clock with alarm
ES459245A1 (en) Improvements in circuits for electronic digital clocks. (Machine-translation by Google Translate, not legally binding)