— 5 —
KEY TOUCH LSI(HG52E35P)
By counting the time between the first key input signal FI and the second SI from the keyboard unit, the key
touch LSI detects key velocity of 256-step. Then the LSI sends the CPU note numbers and their velocities.
Pin No.
Terminal
In/Out
Function
1
REQB
Out
Interrupt request. Not used.
2,3
FI10,SI10
In
Connected to +5V.
4
VCC
In
+5V source.
5
CRDB
In
Read enable signal.
6
CWRB
In
Write enable signal.
7
CCBB
In
Chip select signal.
8
T
In
Test terminal. Connected to +5V.
9
STYB
In
Standby terminal. Connected to +5V.
10
RESB
In
Reset signal.
11
W
In
Test terminal. Connected to +5V.
12
CKI
In
External clock input.
13
TMD
In
Test terminal. Connected to ground.
14
TST
In
Test terminal. Connected to ground.
15
CKO
Out
External clock output. Not used.
16
GND
In
Ground(0V) source.
17
XIN
In
Clock pulse input. Connected to ground.
18
XOUT
Out
Clock pulse output. Not used.
19
TRES
In
Test terminal. Connected to ground.
20~28
CD0~CD7
In/Out Data bus.
24
GND
In
Ground(0V) source.
29~31
CA0~CA2
Out
Address bus.
32
VCC
In
+5V source.
33~43
33~43
53~55
53~55
57~63
57~63
FI0~FI9
FI0~FI9
SI0~SI9
SI0~SI9
In
Key input signal.
40
VCC
In
+5V source.
44~53
KC0~KC7
Out
Key scan signal.
48,56
GND
In
Ground(0V) source.
54
VCC
In
+5V source.
Keyboard
KC0~KC7
FI0~FI9
SI0~SI9
Key Touch LSI
HG52E35P
RESB
CCSB
CWRB
CRDB
CKI
P30/D0~P37/D7
P12/A2~P10/A0
CA0~CA2
CD0~CD7
D0~D7
A0~A2
CPU
HD6433298A16P
P52/SCK
A12
A14
P44/-WR
P42/IRQ0
P43/-RD
P46/PHI
Summary of Contents for CTK-650
Page 1: ...with price CTK 650 ELECTRONIC KEYBOARD R CTK 650...
Page 14: ...12 1 10 11 12 13 2 5 3 6 4 7 17 8 9 16 15 19 18 14 PCB VIEW MAJOR WAVEFORMS...
Page 15: ...13 18 19 16 17 9 8 14 15 4 7 3 6 2 5 10 11 12 13 1 SCHEMATIC DIAGRAM M5711 MA1M...
Page 16: ...14 SCHEMATIC DIAGRAM M5711 CN1M...
Page 21: ...19 EXPLODED VIEW...
Page 22: ...MA0200941A...
