LG KP500 - Keypad Switching & Scanning

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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
C
LR
V
B
AT
S
E
ND
D
N
U
P
C
A
M
E
N
D
H
O
L
D
)5(NI_PK
DNE
)3(N
I
_PK
)
0(
TU
O_P
K
)2(TU
O_P
K
)3(TUO
_P
K