Information processing unit

Details Information processing unit Information processing unit

1982-01-13

1984-09-04

Smith, Jerry

Boots, shoes, and leggings

G06F 304

Patent

active

044701136

ABSTRACT:
An information processing unit, such as a central processor, microprocessor or one-chip microcomputer, which can be used as either a master unit or a slave unit yet does not require the provision of extra external terminals for control signals. The unit is provided with first and second bidirectional input/output ports and an internal bus coupled to both of the first and second input/output ports. The input/output mode of the two busses can be controlled either by an internally-generated control signal or by an externally-supplied control signal inputted to the unit. The one of the first and second control signals used for controlling the transmission modes of the input/output ports is determined in accordance with data input through one of the input/output ports and stored internally of the unit.

REFERENCES:
patent: 4028663 (1977-06-01), Royer et al.
patent: 4047162 (1977-09-01), Dorey et al.
patent: 4124891 (1978-11-01), Weller et al.
patent: 4212080 (1980-07-01), Milliken
patent: 4229791 (1980-10-01), Levy et al.

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