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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
3.8. Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 8 rows (outputs from
Port Control Logic) and 8 columns (inputs to PCL). The number of rows and columns depend on settings
of the PCL.
Figure 11. Key pad part key matrix
SW100
SW101
KB4
SW102
KB10
SW103
KB8
KB1
SW104
KB13
SW105
KB7
KB2
SW106
KB3
KB11
SW107
SW108
KB6
KB5
SW109
KB9
KB12
KEY_ROW0
KEY_COL3
KEY_COL2
KEY_COL1
KEY_COL0
KEY_ROW4
KEY_ROW3
KEY_ROW2
KEY_ROW1
KEY_COL4
8
*
DOWN
5
CLR
9
CAMERA
2
#
MENU
RIGHT
KEYPAD
1
UP
7
SEND
SEL
FAV
4
LEFT
3
0
CONF
6
ON-END
VBAT
END_KEY
END
END KEY
R227
10K
KTC4075E
Q201
1
2
3
100k
R228
KEY_COL2
KEY_ROW0
END_KEY
END_KEY_IN