| 摘要 |
The format of scan data is changed by option switches deposied in a key matrix so that functions of key is expanded. The circuit comprises a matrix switch(22) for generating scan data, a scan decoder(24) for generating an option data by decoding the scan data generated by the matrix switch(22) and for generating a first and a second clock signal, a first and a second latch(26,28) for latching the first and the second data according to the first and the second clock signal, and an adder(30) for selecting the output signals of the first and the second latch according to the option data.
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