Casio CTK-650 User Manual
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CIRCUIT DESCRIPTION
CPU(HD6433298A16P : H8/329)
The 16-bit CPU contains a 32K-byte ROM, a 1K-byte RAM, an 8-bit A/D converter, timers and I/O ports. The
CPU accesses to the DSP, Key Touch LSI, RAM, buttons and LEDs. But the CPU directly receives MIDI and
pedal signals.
CPU accesses to the DSP, Key Touch LSI, RAM, buttons and LEDs. But the CPU directly receives MIDI and
pedal signals.
Pin No.
Terminal
In/Out
Function
1
P40/IRQ2
In
KO signal data.
2
P41/IRQ1
In
Timing signal for KO signal.
3
P42/IRQ0
In
APO signal output.
4
P43/-RD
Out
Read signal outpt.
5
P44/-WR
Out
Write signal output.
7
P46/PHI
Out
System clock output.
8
P47/-WAIT
In
Wait signal input
9
P50/Txd
Out
MIDI signal output.
10
P51/Rxd
In
MII signal input.
11
P52/SCK
Out
Reset signal output.
12
-RESET
In
Reset signal input.
13
-NMI
In
Power on signal input.(Low active)
14
Vcc
In
+5V source.
15
-STBY
In
Standby signal input. Connected to +5V.
16
Vss
In
Ground(0V) source.
17,18
XTAL,EXTAL
In/Out 20MHz clock pulse input/output. Connected to crystal.
19,20
MD1,MD0
In
Selection for system.
MD1 MD0
MODE
0
1
MODE-1 : Internal ROM mode
1
0
MODE-2 : Non internal ROM mode
1
1
MODE-3 : Single chip mode
21
AVss
In
Analog ground source.
22
P70/AN0
In
Connected to ground.
23~29
P71/AN0~P77/AN7
In
KI signal input.
30
AVcc
In
+5V source.
31~38 P60/FTCI~P67/TMO1
Out
Control signal for 7-segment LED.
39
Vcc
In
+5V source.
41~56
P26/A14~P10/A0
Out
Address bus.
48
Vss
In
Ground(0V) source.
57~64
P30/D0~P37/D7
In/Out Data bus.