XAPP512 - Implementing Keypad Scanners

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Xilinx

Part number	XAPP512
Manufacturer	Xilinx
File Size	313.51 KB
Description	Implementing Keypad Scanners
Datasheet	XAPP512 Datasheet
Additional preview pages of the XAPP512 datasheet.

of Verilog source code for a keypad scanner.

into them, they require more effective ways of entering data. Most cell phones, for example, use the standard DTMF style keypad and a multi-tap process to enter alphanumeric data; however, for larger amounts of data multi-tapping becomes cumbersome. More and more high-end phones are therefore employing QWERTY keypads that make entering data easier and quicker. Going from a DTMF to a QWERTY keypad requires more I/O. For instance, a DTMF keypad might have 4 rows and 3 columns, where a QWERTY keypa.

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Published: Jul 5, 2006 |