Cpu (Msm6567-15) - Casio CTK-450 Service Manual

CPU (MSM6567-15)

Containing sound data ROM and DAC (Digital to Analog Convertor), the CPU provides sound waveform in
accordance with the pressed key and the selected tone.
The following table shows pin function of the LSI.
Pin No. Terminal
1 LEDY0
2 LVDD1
3 LGND2
4 ~ 9 LEDX0 ~ LEDX5
10 LEDX6
11 LEDX7
12 LVDD2
13 ~ 27
28 GND2
29 COSI
30 COSO
31 VDD
32 GND2
33 ~ 35 TEST1 ~ TEST3
36 MI
37 -RESET
38 AVDD
39 OUT
40 AGND
41 ~ 48 KI0 ~ KI7
49 ~ 63 KO0 ~ KO14
64 ~ 72
73 LGND1
74 ~ 80
In/Out
Out Not used.
In +5V source
In Ground (0V) source
Out Not used.
Out APO(Auto Power Off) signal output
Out Not used.
In +5V source
Not used.
In Ground (0V) source
In 43.45MHz clock pulse input
Out 43.45MHz clock pulse output
In +5V source
In Ground (0V) source
Not used. Connected to ground.
In Not used. Connected to +5V.
In Reset signal input
In Ground (0V) source for internal DAC
Out Sound waveform output
In Ground (0V) source for internal DAC
In Input terminals for keys and switches
Out Key and switch scan signal output
Not used.
In Ground (0V) source
Not used.
— 5 —
Function
ON: "H" OFF: "L"