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2.4 S5U1C88348T Key Board
The 50 keys on this board comprise a 5 × 10 key matrix. Figure 2.4.1 provides the key layout, while Table
2.4.1 provides the configuration for the key matrix.
In
KI0 (K00)
KI1(K01)
Out
KO0 (P15)
Esc
KO1 (P16)
1
KO2 (P17)
Q
KO3 (R27)
A
KO4 (R34)
Z
Each key comprises the key-scan circuit shown in Figure 2.4.2.
In a program, one KO signal is set low and all KI signals are read. When a key is depressed, the corre-
sponding KI signal is 0; when no key is depressed, the KI signal is 1.
This is performed for all KO signals. To eliminate the noise caused by chattering and such, some correc-
tive measures such as multiple key reads should be incorporated in a program.
S5U1C88348T HARDWARE MANUAL
Esc
Caps
Shift
!
"
#
$
1
2
3
4
*
/
+
-
Q
W
E
R
-Y
+Y
_
`
,
.
A
S
D
F
-M
+M
<
>
Z
X
C
V
Del
Erase
BS
Fig. 2.4.1 Key Layout
Table 2.4.1 Key Matrix
KI2 (K02)
KI3 (K03)
Caps
Shift
4
2
3
R
W
E
F
S
D
V
X
C
Erase
KOx
Fig. 2.4.2 Key-Scan Circuit
2 BOARD CONFIGURATION AND CONTROL OF EACH UNIT
Submode
Mode
%
&
'
(
5
6
7
8
=
?
;
:
T
Y
U
I
\
^
·
°
G
H
J
K
B
N
M
Prev
←
Space
Char
KI4 (K04)
KI4 (K05)
KI6 (K06)
5
6
T
Y
G
H
B
N
BS
Space
KIx
EPSON
On/Off
)
@
9
0
[
]
O
P
¥
C-Return
L
Enter
↑
Next
↓
→
KI7 (K07)
KI8 (K10)
7
Mode
9
U
8
O
J
I
L
↑
M
K
←
↓
Char
KI9 (K11)
On/Off
0
P
Enter
→
II-5
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