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MAJOR WAVEFORMS
1POWER ON signal
UPD912GF-3BA pin 21
2APO signal
UPD912GF-3BA pin 3
3Reset signal for the DSP
UPD912G-3BA pin 99
5Key scan signal KC0
UPD912GF-3BA pin 31
6Key scan signal KC1
UPD912GF-3BA pin 32
7Key scan signal KC2
UPD912GF-3BA pin 33
4Synchronizing pulse
UPD912GF-3BA pin 6
AWord clock LRCK
UPD912GF-3BA pin 13
BData signal SO
UPD912GF-3BA pin 12
CBit clock BCK
UPD912GF-3BA pin 11
DWord clock LRCK
UPD6379GR pin 1
EData signal SI
UPD6379GR pin 2
FBit clock CLK
UPD6379GR pin 3
8LED drive signal PB0
HG51B227FB pin 80
9LED drive signal PB1
HG51B227B pin 1
0LED drive signal PB2
HG51B227FB pin 2
GDAC output (R-ch)
UPD6379GR pin 5
HDAC output (L-ch)
UPD6379GR pin 8
IAmp. input (R-ch)
LA4598 pin 6
JAmp. input (L-ch)
LA4598 pin 10
Note: On
Tone : Whistle (70)
Key : A4
Touch response : Off
Reverb : Off
Volume : Maximum

1

2

3

0.1 s
CH1
CH2
CH1: CH2: 5 V5 V

4

20 µs
CH1
5 VCH1:

5

6

7

CH1
CH2
CH3
50 µs
5 VCH1: 5 VCH2: 5 VCH3:

8

9

0

CH1
CH2
CH3
5 VCH1: 5 VCH2: 5 VCH3:
5 ms

A

B

C

CH1
CH2
CH3
2 µs
5 VCH1: 5 VCH2: 5 VCH3:

D

E

F

CH1
CH2
CH3
2 µs
5 VCH1: 5 VCH2: 5 VCH3:

G

H

CH1: . 1 V
~
CH1
CH2
CH2: . 1 V
~
1 ms

I

J

CH1
CH2
CH1: . 1 V
~CH2: . 1 V
~
1 ms