Action direction port expansion circuit and system

Details Action direction port expansion circuit and system Action direction port expansion circuit and system

1988-05-12

1991-10-22

Fleming, Michael R.

Boots, shoes, and leggings

364200, 364900, 123371, G06F 104

Patent

active

050601342

ABSTRACT:
Circuitry is provided which effectively expands one, and preferably two or more, high resolution timed outputs of a microprocessor device such that a larger number of output signals are selectively, and independent of one another, switched to output states at times determined in accordance with the occurrence of the timed outputs of the microprocessor. Essentially, high resolution event time occurrence information is provided by a microprocessor dedicated output port. Previously, information on a microprocessor data bus and address bus is utilized to selectively enable certain desired ones of a plurality of output latches and determine the next desired state of such enabled latches. All of the output latches effectively receive the high resolution timed output signal of the microprocessor. The result is an advantageous and cost effective high resolution expansion of the microprocessor outputs. Preferably the microprocessor has two dedicated timed output ports which effectively implement control of three or more independently operative output devices, such as fuel injectors of an automotive control system and/or spark/dwell or knock sense circuitry of such a system.

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patent: 4467420 (1984-08-01), Murakami et al.
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patent: 4575794 (1986-03-01), Veneski et al.
patent: 4866598 (1989-09-01), Sonneek et al.
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Pages 1 through 4 and Drawing FIGS. 1-4 of Motorola Patent Disclosure A-872.
Literature for the Advanced Micro-Device AM9513, pp. 1-2, 1-6, 1-11 and 1-29.
Literature for the Advanced Micro-Device NEC 78312, pp. 101 through 111.

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