4 × 4 matrix keyboard recognition technology (1.4 × 4 matrix keyboard recognition processing (2. Each key has its row value and column value, the value and the value of the portfolio is set out to identify the key number. Matrix line line line and out through the two parallel CPU interface and communications. The state of each key the same need to become a digital "0" and "1", switch on one end (line out) then through the resistor VCC, and ground through the output number "0" to achieve. keyboard processing task is to: determine whether the key pressed to determine which key to press, what key features would also like to eliminate the disconnect button when in the closed or jitter. two parallel population, a key scan output, so that key dynamic grounding line, and the other parallel port input keys, and by the line scan values and the formation of a common feedback signal coding and identification of key buttons, through the software look-up table for identifying the key fu

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