Patent
1992-01-16
1993-03-02
Richardson, Robert L.
G06F 1300
Patent
active
051916541
ABSTRACT:
A microprocessor is provided with one input/output port per bit including a decoder 6 for determining whether or not a bit assigned to the input/output port is selected for a procesing operation in an output mode, and a processing circuit 12 for processing an operation that has been designated. The processing circuit 12 comprises at least one processing element for processing supplied 1-bit data for the processing and/or output latch data held inside the processing circuit itself. The processing element is selected by separately inputted processing information for outputting processed data. A masking circuit outputs the processed data from an output terminal only when an output signal from the decoder 6 indicates that the bit assigned to the input/output port is selected.
REFERENCES:
patent: 4471426 (1984-09-01), McDonough
NEC Corporation
Richardson Robert L.
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