Noise-tolerant data communication system

Details Noise-tolerant data communication system Noise-tolerant data communication system

2008-08-05

2011-12-20

Tsai, Henry (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output process timing

C713S400000

Reexamination Certificate

active

08082375

ABSTRACT:
This invention offers a data communication system that can perform data communication and detection of a data read-in request signal while reducing the number of communication lines to three, and is tolerant of noise. The data communication between a microcomputer and a key scan IC and the detection of the data read-in request signal are performed through a control line, a clock line and a data line. The data communication system is provided with a data line control circuit that controls the data line so that outputting of the data read-in signal RDRQ to the data line is disabled when first command data is inputted to the key scan IC through the data line, and that the outputting of the data read-in request signal RDRQ to the data line is enabled when second command data is inputted from the microcomputer to the key scan IC through the data line.

REFERENCES:
patent: 2002/0054684 (2002-05-01), Menzl
patent: 2002/0105842 (2002-08-01), Uchida et al.
patent: 2005/0245218 (2005-11-01), Jayaramen
patent: 2006/0277426 (2006-12-01), Lindorfer et al.
patent: 9-238150 (1997-09-01), None
patent: 9-238151 (1997-09-01), None

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