Keypad Switching & Scanning - LG KF600d Service Manual

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.
END KEY
END_KEY
KP_IN(0:5)
KP_OUT(0:3)
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Only for training and service purposes
VBAT
END
SEND
KP_IN(0)
1
KP_IN(1)
4
KP_IN(2)
7
KP_IN(3)
STAR
KP_IN(4)
KP_OUT(0)
KP_OUT(1)
KP_OUT(2)
KP_OUT(3)
Figure 12 Key pad part key matrix
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3. TECHNICAL BRIEF
R321
1
END_KEY
10K
C
2 3
5 6
8 9
0 SHARP
END_KEY_IN
KP_IN(0)
3
Q301
2SC5663
2
KP_OUT(2)
AF CAM
MP101
VOL UP
VOL DOWN
LGE Internal Use Only