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Key-matrix
The key-matrix (example above) detects if a key is pressed. The uC has KOUTx set to 0. In turn it
threstates KINx and listen. KINx is per default "HIGH" (above 0.7xVcc). If KINx is detected as being
less than 0.3xVcc it measures KOUTx and thus detects which key is pressed. This information tells
the software which data package to transmit.
Programming interface
Technical description for
HC20 schematic
Side 5/7
Rev. A
Date:
2014-09-26
Init: TOP
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