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Kontron
Matrix-Keyboard Interface
40
MOPS/386A User’s Guide
18.4
Enhanced Matrix Keyboard
If you need a larger matrix, you can enhance the matrix to 16*10 crossings. To achieve
this, you will need external circuitry, which is shown in the following diagram.
18.5
1
3
5
7
9
1
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
2
4
6
8
10
12
14
16
18
20
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1
3
5
7
9
1
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
GND
RA0
RA1
RA2
RA3
RA4
RB0
RB1
RB2
RB3
RB4
RB5
RB6
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
MCLR/
ENPBLT
RB7
VCC
GND
RA0
RA1
RA2
RA3
RA4
RB0
RB1
RB2
RB3
RB4
RB5
RB6
GND
VCC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
MCLR/
ENPBLT
RB7
Y8
Y9
Y10
Y1
Y12
Y13
Y14
Y15
KEY
KEY
13
12
1
10
6
5
4
3
QH
QG
QF
QE
QD
QC
QB
QA
74HCT 164
Clk
Clr
A
B
Y7
1
2
VCC
VCC
RB6
Adapterboard
MOPS/386A
1
3
5
7
9
1
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
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24
26
Matrix-Keyboard
1
3
5
7
9
1
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
Matrix