Parallel input-output circuit permitting reduce number of pins i

Details Parallel input-output circuit permitting reduce number of pins i Parallel input-output circuit permitting reduce number of pins i

1993-05-27

1995-08-15

Coleman, Eric

Boots, shoes, and leggings

3642381, 3642444, 364247, 3642601, 364DIG1, G06F 1300

Patent

active

054428009

ABSTRACT:
A single chip microcomputer has a parallel input-output port. The port comprises: an external input shift register with a parallel input port; an external output shift register with a parallel output port having a latch circuit; and a plurality of internal port units coupled in series to each other. Each of the plural port internal units comprises a data register and a shift register coupled to the data register, the data register being coupled to an internal bus. A serial input device couples the external output shift register with the shift register in the internal port unit existing at a terminal point of the internal port series; whereas a serial output device couples the external input shift register with each of the shift registers in the internal port units. A control circuit coupled to both the external input and output shift registers controls shift performances of the external input and output shift registers.

REFERENCES:
patent: 4627046 (1986-12-01), Bellamy
patent: 4714922 (1987-12-01), Cripps
patent: 4833605 (1989-05-01), Terada
patent: 4851834 (1989-07-01), Stockebrand
patent: 5005151 (1991-04-01), Kurkowski

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