LG -A270 Service Manual page 34

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The Keypad has two parts : the keypad interface including 5 columns and 6 rows with one dedicated power –

key and the key detection block with the " key pressed" and " de-bounce" mechanisms.

Each time when the key is pressed or released, something different in the 6x5 matrix or power-key, the key

detection block will sense the change and check if a key has been pressed or released. Whenever

directly in KP_MEM1, KP_MEM2,KP_MEM3, and KP_MEM4 registers. To ensure no key pressed information is

lost, the status register in the keypad is not read-cleared by APB read command. The status register can only

be changed by the key-pressed detection FSM.

LGE Internal Use Only

Figure 3.10.2 Block Diagram and System Integration of the KPD

O nly for training and service purposes

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3. TECHNICAL BRIEF

Only for training and service purposes

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