Panasonic JB-3300 Technical Manual page 305

BLOCK DIAGRAM
CN1
CN1
CN1
Micro-
processor
KBDATA = INT rae
Interface |
oes PIO |
P27
KBCLEK TO
Interface
Pil
H.R
Interface emRES
OBO
|
|
LED |
Driver hel p15 |
P12 !
(No.81) |
087
LED
Power j
Suppl Driver
PP*Y P13 paer—j 3
(No.17)
X 1
X2
—e- 45 V
—pe- GND
The operation at each stage is
Figure 3-1 Block Diagram
IV -
scan [J
Driver| _|
—— Key Matrix
peo
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@
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