| 摘要 |
a power unit(100) for supplying an electric power for each terminal; a micro computer(101) for controlling in an entire operation of a system; a display unit(102) for displaying corresponding functions by a micro computer; an encoder circuit(103) for outputting an encoder key inputting signal by receiving a display signal through common terminals; and a key matrix unit(104) for loading a key input and an encoder input commonly to a micro computer port. The apparatus reduces the number of input ports to the micro computer.
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