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Key Matrix
KI0
KI1
KO0
F3
F#3
KO1
C#4
KO2
A4
A#4
KO3
F5
F#5
KO4
Tone 0
Tone 1
KO5
Tone 5
Tone 6
KO6
CPU (LSI1: MSM6387-03)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound wave-
form in accordance with the pressed key and the selected tone.
The following table shows the pin functions of LSI1.
Pin No.
Terminal
1, 2
TEST1, TEST2
3
RESET
4
AVDD
5
OUT
6
AGND
7
GND
8, 9
COSI, COSO
10
VDD
11 ~ 18
KI0 ~ KI7
19 ~ 23
KO11 ~ KO7
24 ~ 30
KO6 ~ KO0
CIRCUIT DESCRIPTION
KI2
KI3
G3
G#3
D4
D#4
B4
G5
G#5
Tone 2
Tone 3
Tone 7
Tone 8
In/ Out
Not used. Connected to ground.
In
Power ON reset input. On: +6 V Off: 0 V
In
+5 V sorce for the built-in DAC
Out
Sound waveform output
In
Ground (0 V) source for the built-in DAC
In
Ground (0 V) source
In/Out
21.725 MHz clock pulse input/output
In
+5 V source
In
Input terminal from keys and switches
Not used.
Out
Key and switch scan signal output
— 3 —
KI4
KI5
A3
A#3
E4
F4
F#4
C5
C#5
D5
A5
A#5
Tempo
Tone 4
Up
Tone 9
Stop
Function
KI6
KI7
B3
C4
G4
G#4
D#5
E5
B5
C6
Volume
Select
Up
Tempo
Volume
Down
Down
Demo
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