Microprocessor data input switching circuit - uses interrogated switch groups connectable to multiple channel data bus

A circuit delivering input data to a microprocessor circuit has switches, esp. keyboard switches, which place switching signals onto a data bus connected to the microprocessor and having several data channels. The switches are connected to a common reference potential. It requires only a few channel...

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Bibliographic Details
Main Authors HAUBNER,GEORG, SCHRUMPF,HANS
Format Patent
LanguageEnglish
German
Published 18.10.1979
Edition2
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
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Summary:A circuit delivering input data to a microprocessor circuit has switches, esp. keyboard switches, which place switching signals onto a data bus connected to the microprocessor and having several data channels. The switches are connected to a common reference potential. It requires only a few channels connecting the switches to the circuit and includes a facility whereby a user connection signal is returned. The switches are arranged in groups of a number equal to the number of data channels being used. Interrogation pulses activate the switch groups.
Bibliography:Application Number: DE19782815234