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Casio CTK-220L User Manual

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— 4 —
Pin No.
Terminal
In/Out
Function
1
MA14
—
Not used.
2
MWEB
Out
Clock for LED latches
3 ~ 5
—
—
Not used.
6
MA0
Out
7-seg. LED drive signal
7 ~ 19
MA1 ~ MA11
—
Not used.
20 ~ 27
MD0 ~ MD7
Out
7-seg. LED drive signal
28, 29
NC1, NC2
—
Not used.
30
DGND
In
Ground (0 V) source
31
DVCC
In
+5 V source
32, 33
XTLO, XTLI
In/Out
20 MHz clock input/output
34
NC3
—
Not used.
35
RSTB
In
Reset signal input
36
P24/RXD
—
Not used. Connected to +5 V.
37
P25/TXD
—
Not used.
38
NMI
In
Power ON signal input. Connected to +5 V.
39
APO
Out
APO (Auto Power Off) signal output
40
NC4
—
Not used.
41
REFH
Out
Terminal for the internal DAC
42, 43
NC5, NC6
—
Not used.
44
DAOR
Out
Right channel sound waveform output
45
NC7
—
Not used.
46
AVdac
In
+5 V source for the internal DAC and ADC
47
DAOL
Out
Left channel sound waveform output
48
REFL
Out
Terminal for the internal DAC and ADC
49
AGdac
In
Ground source for the internal DAC
50
AGadc
In
Ground source for the internal ADC
51
ANI
—
Not used. Connected to ground.
52
AVadc
In
+5 V source for the internal ADC
53
NC8
—
Not used.
54
MOD0
In
Mode selection terminal. Connected to +5 V.
55, 56
MOD1, MOD2
In
Mode selection terminal. Connected to ground.
57
P40
In
APO cancellation signal
58 ~ 65
KI0/P30 ~ KI7/P37
In
Terminals for key/button input signal
66 ~ 73
KO0/P50 ~ KO7/P57
Out
Terminals for key scan signal
74 ~ 77
KO8/P20 ~ KO11/P23
Out
Terminals for button input signal
78
NC9
—
Not used.
79
LVCC
In
+5 V source
80 ~ 95
LX0 ~ LX7, LY0 ~ LY7
Out
LED drive signal
96
LGND
In
Ground source
97 ~ 100
MA18 ~ MA15
—
Not used.
CPU (LSI1: MSM6755B-13)
The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound
waveform in accordance with the pressed key and the selected tone.  The CPU also controls key input, button
input and LED driving.  The following table shows the pin functions of LSI1.