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CPU (LSI1: GT913F)
The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.
The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from
the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with
the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the
CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores
sequencer data into the working storage RAM.
The following table shows the pin functions of LSI1.
P
n i
N
. o
T
r e
m
1
T
X
2
R
X
3
S
C
4
T
X
5
R
X
6
S
C
7
A
V
8
A
N
9
A
N
1
0
A
G
1
1
B
C
1
2
S
1
3
L
R
1
4
G
N
1
, 5
1
6
X
L
T
, 0
1
7
V
C
1
, 8
1
9
M
D
, 0
2
0
R
S
2
1
N
2
2
N I
T
P /
F
0 I
~
2
3
~
3
0
S
0 I
~
3
1
~
3
8
K
C
0
~
F
4 I
~
3
9
~
4
6
S
4 I
~
4
, 7
4
8
I F
, 8
4
9
F
5
0
S
5
1
F
1 I
5
2
S
1 I
0
5
3
~
5
5
K
0 I
~
5
6
M
W
n i
l a
I
/ n
O
t u
D
0
O
t u
N
t o
D
0
n I
N
t o
K
0
O
t u
A
P
D
1
O
t u
M
I
D
1
n I
M
I
K
1
O
t u
1
M
C
C
n I
D
V
A
C
+
5
0
n I
b
e
a
d
1
—
N
t o
N
D
n I
G
o r
K
O
t u
B
t i
O
O
t u
S
r e
C
K
O
t u
W
o
D
n I
G
o r
X
L
T
1
I
/ n
O
t u
3
0
C
n I
+
5
M
D
1
n I
M
o
T
B
n I
R
e
M
I
n I
P
o
1
0
I
/ n
O
t u
D
a
F
3 I
n I
T
r e
S
3 I
K
C
7
O
t u
T
r e
F
7 I
n I
T
r e
S
7 I
S
8 I
—
N
t o
9 I
n I
T
r e
9 I
n I
D
a
0
n I
T
r e
P /
2
3
O
t u
D
a
K
2 I
n I
T
r e
N
B
O
t u
W
i r
F
u
u
s
e
d
u
s
e
d
O
A (
u
o t
P
o
w
r e
O
) f f
s
g i
n
I D
s
g i
n
l a
o
u
p t
t u
I D
s
g i
n
l a
n i
p
t u
H
Z
y s
n
c
h
o r
n
z i
n i
g
p
u
s l
e
D
D
+ (
5
) V
s
o
u
c r
e
a
d
a
t p
r o
d
e
e t
t c
o i
n
t
r e
m
n i
V
w
h
e
n
h t
e
k
e
y
b
o
a
d r
s i
c
o
m
e
s
0
V
o t
c
a
n
c
l e
h t
e
a
t p
r o
s i
c
o
n
n
e
c
e t
. d
u
s
e
. d
C
o
n
n
e
c
e t
d
o t
g
o r
u
n
d
0 (
) V
s
o
u
c r
e
c
o l
k c
o
u
p t
t u
a i
s l
o
u
n
d
d
a
a t
o
u
p t
t u
d r
c
o l
k c
o
u
p t
t u
u
n
d
0 (
) V
s
o
u
c r
e
M
H
z
c
o l
k c
n i
p
t u
o /
u
p t
t u
V
s
o
u
c r
e
d
e
s
e
e l
t c
o i
n
t
r e
m
n i
l a
s
t e
s
g i
n
l a
n i
p
t u
w
r e
O
N
s
g i
n
l a
n i
p
t u
a t
b
u
s
f
r o
h t
e
L
C
D
r d
v i
r e
m
n i
a
f l
r o
k
e
y
n i
p
t u
s
g i
n
m
n i
a
f l
r o
k
e
y
c s
a
n
s
g i
n
m
n i
a
f l
r o
k
e
y
n i
p
t u
s
g i
n
u
s
e
d
m
n i
a
f l
r o
b
t u
o t
n
n i
p
t u
s
g i
a t
b
u
s
f
r o
L
C
D
r d
v i
r e
m
n i
a
f l
r o
b
t u
o t
n
n i
p
t u
s
g i
a t
b
u
s
f
r o
h t
e
L
C
D
r d
v i
r e
m
n i
a
f l
r o
b
t u
o t
n
n i
p
t u
s
g i
e t
e
n
a
b
e l
s
g i
n
a
f l
r o
h t
e
— 7 —
n
t c
o i
n
l a
o
u
p t
t u
o
u
p t
t u
a
. l
p
o
w
e
e r
d
b
y
b
a
t t
r e
e i
s
a
n
A
P
O
u f
n
t c
o i
n
w
h
e
n
A
C
u
n
. d
l a
l a
l a
n
l a
n
l a
n
l a
D
S
P
d
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