Bit expansion circuit

Details Bit expansion circuit Bit expansion circuit

1981-11-25

1983-09-13

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 59, 370 68, 34082504, H04Q 900, H04J 300

Patent

active

044045565

ABSTRACT:
A n-bit parallel output port of a programmable controller (22) is coupled to a bit expansion circuit (24). A plurality of channel-select bits are decoded by a multiplexer board (26) to select and enable any one of sixteen output channels. A plurality of line-select bits are fed to a memory section (28) to facilitate the selection of any one of a plurality of output lines associated with the enabled channel. The selected output line remains latched in their most recent output state when the selected channel is disabled by the controller (22).

REFERENCES:
patent: 3761915 (1973-09-01), Henegar et al.
patent: 3924079 (1975-12-01), Garrett
patent: 3959596 (1976-05-01), Bojanek et al.
patent: 4032893 (1977-06-01), Moran
patent: 4143359 (1979-03-01), Beelitz
patent: 4176287 (1979-11-01), Remedi
patent: 4177455 (1979-12-01), Armstrong et al.
The "digital" Logic Handbook, pp. 247-249, 1966-1967 Edition.
Hewlett Packard's Operating and Service Manual for a Multiprogrammer Model 6940B HP Part No. 06940-90005.
Hewlett Packard's Operating and Service Manual for an Open Collector Output Card Model 69332A HP Part No. 69332-90001.

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