3.7 KEYPAD Interface
The keypad interface is connected to the X-Bus, together with the XBIU and the Shared Memory
Register, using a single Bus Interface.
The keypad supports two scan modes:
• By default, the keypad is a 4x6 scan matrix (4 input and 6 output pins).
• To set the keypad to a 5x5 scan matrix (5 input and 5 output pins)
The scan mode should be determined at the very beginning of the system start because changes are
not allowed later.
3. TECHNICAL BRIEF
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Figure 3-7 KEY MAXTRIX Interface
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