Compound type of keyboard detector
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United States of America Patent
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-
Sep 16, 1997
Grant Date -
N/A
app pub date -
Feb 26, 1996
filing date -
Feb 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compound type keyboard detector is disclosed. It comprises a time-sequencing generator, a keyboard scanner, a column input port and a row input port, a column lock and a row lock, a keyboard-synchronization detector, a keyboard detector and a keyboard decoder. With the unique design of the keyboard detector in conjunction with the various circuits that are associated therewith, a given number of pins can be used for a relatively greater number of input keys, or a smaller number of pins can be used for relatively complicated input keyw. This type of keyboard detector is good for small IC products, and can reduce the manufacturing cost thereof.
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