3.9 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.
- 40 -
3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
[Figure 3.9-1] Number key circuit diagram
[Figure 3.9-2]
Function key circuit diagram
KEY PAD
RIGHT
UP
VA801
EVLC5S0250
LEFT
VBAT
SOFT802
EVLC5S0250
VA804
MENU
OK
CALL
VA803
EVLC5S0250
SOFT801
SOFT803
END
VA807
EVLC5S0250
VA808
EVLC5S0250
VA806
EVLC5S0250
DOWN
VA805
EVLC5S0250
VA802
EVLC5S0250
KEYIN5
KEYIN4
KEYIN3
END_KEY
KEYOUT5
KEYOUT3
KEYOUT2
KEYOUT1
3
9
#
8
2
1
5
7
*
NUMBER KEY PAD
6
4
0
KB301
306
305
308
302
KB_STAR
310
309
304
301
303
307
KEYOUT1
KEYOUT3
KEYIN0
KEYOUT2
KEYIN1
KEYIN2
KEYOUT5
Содержание KP275
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