LG KP500, Руководство по обслуживанию

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.8 Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 3 rows (outputs
from Port Control Logic) and 2columns (inputs to PCL). The number of rows and columns depend on
settings of the PCL.
Figure 10 Key pad part key matrix
D A P Y E K
CLR
VBAT
SEND DN
UP
CAM
END
HOLD
) 5 ( N I _ P K
D N E
) 3 ( N I _ P K
) 0 ( T U O _ P K
) 2 ( T U O _ P K
) 3 ( T U O _ P K