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Enhanced Matrix Keyboard
18.4
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
MOPS/386A
Matrix-Keyboard
Matrix-Keyboard Interface
2
GND
1
RA0
4
3
RA1
6
5
RA2
8
7
RA3
10
9
RA4
12
1
RB0
14
13
RB1
16
15
RB2
18
17
RB3
20
19
RB4
22
21
RB5
24
23
RB6
26
25
Adapterboard
1
2
3
4
5
6
7
8
9
10
1
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
40
Clr
VCC
Clk
1
A
VCC
2
B
74HCT 164
RB6
GND
Y0
2
KEY
Y1
4
GND
Y2
6
RA0
Y3
8
RA1
Y4
10
RA2
Y5
12
RA3
Y6
14
RA4
Y7
Y7
16
RB0
MCLR/
18
RB1
ENPBLT
20
RB2
22
RB3
RB7
24
RB4
26
RB5
VCC
RB6
Matrix
Kontron
13
QH
12
QG
1
QF
10
QE
6
QD
5
QC
4
QB
3
QA
Y8
1
2
Y9
3
4
Y10
5
6
Y1
7
8
Y12
9
10
Y13
1
12
Y14
13
14
Y15
15
16
KEY
17
18
Y0
19
20
Y1
21
22
Y2
23
24
Y3
25
26
Y4
27
28
Y5
29
30
Y6
31
32
Y7
33
34
MCLR/
35
36
ENPBLT
37
38
39
40
RB7
41
42
43
44
VCC
MOPS/386A User's Guide
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