Digital circuit with improved input/output connections

Details Digital circuit with improved input/output connections Digital circuit with improved input/output connections

1984-11-15

1985-10-15

Perkey, William B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

34082563, 34087014, G03B 1700, H04B 1200

Patent

active

045470561

ABSTRACT:
In connecting a microprocessor to several condition-sensitive switches and several slow-reacting loads such as motors and solenoids, the input/output ports of the microprocessor may be simplified and reduced in number by incorporating a switch and a load on the same output port. Each load is connected to a separate output port. Each switch is also connected between an output port (which is also connected to a load) and a common input port. The switches are interrogated by a time-divided stream of pulses, each pulse being too short to noticeably affect the operation of any load. The closure of a switch is noted by detecting, at the input port, the presence of any pulses that passed through the closed switch.

REFERENCES:
patent: 3776112 (1973-12-01), Wilwerding
patent: 3887277 (1975-06-01), Tepper
patent: 4047155 (1977-09-01), Miller
patent: 4320518 (1982-03-01), Ichiyanagi
patent: 4325623 (1982-04-01), Suzuki et al.
patent: 4401373 (1983-08-01), Nakai

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