Microcomputer having multiplexable input-output port

Details Microcomputer having multiplexable input-output port Microcomputer having multiplexable input-output port

1995-04-11

1997-07-29

Teska, Kevin J.

G06F 1316

Patent

active

056528701

ABSTRACT:
A microcomputer or a one-chip computer has address pins and data pins provided separately, and when a specified control signal is provided, the address pins act as multiplex pins for address and data signals. Further, a combination of bits for address signals and bits for data signals to be provided to the multiplex pins are changed according to a width of an external bus. For example, the data bits D.sub.i are combined with the address bits A.sub.i, as used previously. Further, the data bits D.sub.i-1 are combined with the address bits A.sub.i by shifting by one bit with respect to the address bits. One of the two types of the combination can be selected. If the microcomputer has 16-bit address pins, it can be connected to 8-bit memories having independent address and data pins, while it can also be connected to 8-bit peripherals having multiplex pins without using an external circuit for separating address and data signals.

REFERENCES:
patent: 4306298 (1981-12-01), McElroy
patent: 4484323 (1984-11-01), Beuscher et al.
patent: 5402014 (1995-03-01), Ziklik et al.
patent: 5504669 (1996-04-01), Wakabayashi et al.
patent: 5537353 (1996-07-01), Rao et al.

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