| 摘要 |
An electronic device includes a microprocessor connected to an input keyboard comprising primary conductive lines connected to primary areas and to a terminal. It further includes first, second and third secondary conductive lines connected to secondary areas and to a terminal. It further includes input keys each of which, when operated, establishes contact between a primary area of a primary line and a secondary area of a secondary line to place each of these two lines in a high state. It further includes first and second processors each having a first input connected to the terminal of the first or second secondary line, a second input connected to the terminal of the third secondary line, and an output that is either in the same state as the first or second secondary line to which it is connected if the third secondary line is not in its high state, or in the high state if the third secondary line is in its high state, and is connected, like each primary line terminal, to the microprocessor so that it can determine each key operated as a function of the respective states of the primary lines and the outputs of the first and second processing means.
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