| 摘要 |
A key recognizing circuit is provided to minimize the number of communication ports. Each of 2^n number of binary numbers having the n number of digits corresponds to each key of a key input unit. The n number of signal lines is electrically connected with each key. Each of the n number of signal lines has electrically low and high values according to values 0 and 1 of the bits of the first column, the second column, the third column, and the nth column of the binary numbers corresponding to each corresponding key. |
