Advertisement
Key Matrix
KI0
KO0
F3
KO1
C#4
KO2
A4
KO3
F5
KO4
KO5
KO6
Pitch
KO7
Bend -
KO8
KO9
KO10
Internal
MIDI Out
CPU (LSI101: MSM6387-A23)
Containing a MIDI controller, the CPU outputs MIDI messages in accordance with the pressed keys and
buttons.
The following table shows the pin functions of LSI101.
Pin No.
Terminal
1, 2
TEST1, TEST2
3
RESET
4
AVDD
5
OUT
6
AGND
7
GND
8
COSI
9
COSO
10
VDD
11 ~ 18
KI0 ~ KI7
19
KO11
20 ~ 30
KO10 ~ KO0
CIRCUIT DESCRIPTION
KI1
KI2
KI3
F#3
G3
G#3
D4
D#4
A#4
B4
F#5
G5
G#5
Pad 0
Enter
Pad 5
Volume
Velocity
Velocity
ff
Octave
Octave
Shift C6
Shift C5
In/ Out
Not used. Connected to ground.
In
Power ON reset input. On: +6V Off: 0V
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
21.725 MHz clock pulse input
Not used.
In
+5 V source
In
Input terminal from keys and switches
Out
MIDI signal output
Out
Key and switch scan signal output
KI4
KI5
A3
A#3
E4
F4
F#4
C5
C#5
D5
A5
A#5
Pad 1
Pad 2
Pad 6
Pad 7
Volume
Bend
Up
Down
Sense
Velocity
Velocity
f
mf
mp
Octave
Octave
Shift C4
Shift C3
Function
— 9 —
KI6
KI7
B3
C4
G4
G#4
D#5
E5
B5
C6
Pad 3
Pad 4
Pad 8
Pad 9
MIDI CH.
Control
Pitch
Bend +
Modula-
tion
Velocity
Velocity
p
pp
Octave
Octave
Shift C2
Shift C1
Hide quick links:
Advertisement
