Device for connecting 8-bit and 16-bit modules to a 16-bit micro

Details Device for connecting 8-bit and 16-bit modules to a 16-bit micro Device for connecting 8-bit and 16-bit modules to a 16-bit micro

1986-02-14

1989-07-04

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 1340

Patent

active

048456110

ABSTRACT:
A device for connecting 8-bit and 16-bit modules to a 16-bit microprocessor. Primary data inputs and outputs of the 16-bit microprocessor are coupled, through data buffers, to the information inputs and outputs of half of the 8-bit modules and to primary data inputs and outputs, respectively, of the 16-bit modules, while secondary data inputs and outputs of the 16-bit microprocessor are coupled, through data buffers, to the information inputs and outputs of the other half of the 8-bit modules and to the secondary data inputs and outputs, respectively, of the 16-bit modules. On operations requiring word, or two-byte, exchange operation with the 8-bit modules, a control circuit extends operation of the 16-bit microprocessor allowing the 8-bit modules to work on the two-byte word one byte at a time. The 16-bit modules are capable of word exchange with the 16-bit microprocessor by simultaneously using the primary and secondary inputs and outputs thereof.

REFERENCES:
patent: 3905023 (1975-09-01), Perpiglia
patent: 3914747 (1975-10-01), Barnes et al.
patent: 4181934 (1980-01-01), Marenin
patent: 4494187 (1985-01-01), Simpson
patent: 4513390 (1985-04-01), Walter et al.
patent: 4533992 (1985-08-01), Magar et al.
patent: 4586131 (1986-04-01), Caudel et al.
patent: 4630198 (1986-12-01), I-Yuan

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