Keypad scanner with serial input and output
A key pad scanner having a shift register driving the column lines and a parallel-in serial-out register coupled to the row lines of the keypad Each scanning cycle comprises a multiplicity of sub-cycles in of which serial data signals for the shift register identify a single respective one of the co...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A key pad scanner having a shift register driving the column lines and a parallel-in serial-out register coupled to the row lines of the keypad Each scanning cycle comprises a multiplicity of sub-cycles in of which serial data signals for the shift register identify a single respective one of the column lines The scanner may be coupled to an ASIC entirely by serial data signals |
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