Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Patent
1991-07-23
1993-05-18
Hoff, Marc
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
341155, H03M 112
Patent
active
052124835
ABSTRACT:
An A/D converter comprising a plurality of inputs, an input selection array to select one of the input signals, an A/D circuit providing a digital output and a conversion completion signal, a counter for sweeping a contiguous subset of the input channels sequentially, the counter incrementing once each time the conversion completion signal is asserted and resetting to point to the first channel in the subset after reaching the last channel in the subset, a channel memory for storing the value of the counter while an optional channel is selected for conversion without regard to the present position of the sweeping counter, a return bus, activated by the conversion completion signal, for replacing the value of the counter after the optional conversion is complete and returning to the normal sweep sequence in the previous position in the sequence, thereby avoiding useless conversion operations.
REFERENCES:
patent: 4654632 (1987-03-01), Yoshida et al.
patent: 4742515 (1988-05-01), Dabholker et al.
patent: 4933676 (1990-06-01), Hauge et al.
Short, Kenneth L., "Microprocessors and Programmed Logic", Prentice-Hall, Englewood Cliffs, N.J., 1981, pp. 294-297.
Hoff Marc
Mitsubishi Denki & Kabushiki Kaisha
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