Microcomputer with programmable multi-function port

Details Microcomputer with programmable multi-function port Microcomputer with programmable multi-function port

1979-09-05

1982-09-14

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 300

Patent

active

043498701

ABSTRACT:
A single-chip microcomputer comprises a CPU (1), a RAM (2), a ROM (3), a timer (4), serial I/O communication logic (5), four I/O ports (11-14) and various power supply, clock, and control inputs. One of the I/O ports (13) is user programmable by application of specific signals to mode selection pins (P20-22) for configuration in several possible ways. The programmable port comprises a plurality of lines which each may be individually programmed as input or output lines to peripheral equipment associated with the microcomputer. Alternatively, the port lines can be programmed to serve as a bidirectional data bus to external memory. Alternatively, the port lines can be programmed to be multiplexed data and address lines to external memory. Bus arbitration logic is provided to route data to the CPU from either on-chip memory or external memory.

REFERENCES:
patent: 4016548 (1977-04-01), Law et al.
patent: 4020472 (1977-04-01), Bennett et al.
patent: 4028682 (1977-06-01), Weber et al.
patent: 4041473 (1977-08-01), Bardotti et al.
patent: 4079452 (1978-03-01), Larson et al.
patent: 4087855 (1978-05-01), Bennett et al.
patent: 4093993 (1978-06-01), Sato
Garrow et al., "The Super Component": the one-board computer with programmable I/O, Electronics 2/5/76, pp. 77-84.
Motorola M6800 Microprocessor Applications Manual, 1975, pp. 3-8-3-28.

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