System for facilitating serial data communications utilizing num

Details System for facilitating serial data communications utilizing num System for facilitating serial data communications utilizing num

1997-07-15

2000-02-15

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 53, 710 63, 371 671, G06F 1314, G06F 1320

Patent

active

060264535

ABSTRACT:
An apparatus for improving I/O pin interfaces for serial data communications is disclosed. In accordance with a preferred embodiment of the present invention, an improved serial interface is provided, which comprises an oscillator input, a signal input, a counter, a register, and a data output. The counter is utilized to count the number of cycles of the oscillator input for which the signal input is asserted. The register is utilized to receive a value from the counter when the signal input is next de-asserted. The data output is at a first logical state when the signal input is asserted for fewer oscillation cycles than the value stored in the register and the data output is at a second logical state otherwise, such that only one I/O pin is required for serial communications.

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