Keypad Switching & Scanning - LG KP500 Service Manual

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.
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Only for training and service purposes
P K O _ T U ) 0 (
P K O _ T U ) 2 (
P K O _ T U ) 3 (
VBAT
END
K _ P N I ) 3 (
K _ P N I ) 5 (
N E D
Figure 10 Key pad part key matrix
3. TECHNICAL BRIEF
K Y E P D A
CAM
UP
DN
- 43 -
HOLD
CLR
SEND
LGE Internal Use Only