XAPP512 - Implementing Keypad Scanners
of Verilog source code for a keypad scanner.
The code is used to target the lowest density, 32-macrocell CoolRunnerTM-II XC2C32A CPLD device in a CP56 package (6 mm x 6 mm).
The keypad accommodated in this design has 8 rows and 8 columns.
The design can easily be scaled to target keypads with more o
XAPP512 Features
* 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 employ
