3. TECHNICAL BRIEF
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Keypad I/F
The KEYPAD I/F consists of a number of tri-state KEYPADCOL outputs and KEYPAD ROW inputs.
It has been expanded to a full 8 by 8 matrix. This gives the possibility of up to 64 keys (with an additional
8 if a ghost column is used). The COL outputs have been combined into a single register to simplify
software development. Full flexibility in enabling and disabling rows and columns is also provided.
Note that ROW[7:5] are disabled by default. Software needs to write 0s to enable those ROWs.
Figure 3-32.
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