Sharp XE-A110 - Page 9

XE-A11OVS
Keyboard circuit 10. Display circuit
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CPU
I
‘sT’-KST”‘&2T24s”
Key Mode
Matrix
Svuitdl
~
KR2-KR5
I ~
1.
1
lms
-:
+ 30-1Oops
ST1
.,
.,
ST2 :
KSTn
n
n
n=l-4, m=5-8
KSTm
n
h
KST2 - KST5 of the key strobe signal are used as the Mode switch
strobe signals.
CPU
CPU
““’’””Y*
I I
I
1
I
I
ST1-5 -
SA1-~1
4
4
C3198
2.2K
SDP1
lx
One strobe signal drives two-digit LED.
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