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MIDI SOUND circuit description
MCLK
LCD_RESET
C202
1000p
MIDI_CS
_WR
MELODY_INT
D(0:7)
V_SRAM
The YMU762 has features as described below.
• Simultaneous generation of up to 40 tones:
• Polyphonic synthesizer specification
• Has built-in default tones for FM and Waveform table synthesizers in the ROM, and the tones can
be downloaded to RAM.
• Stream replay with ADPCM/PCM
• Software interrupt mechanism for external synchronization
• Equipped with 8 bit parallel I/F for control from CPU
• Equipped with speaker amplifier and equalizer circuit
• Has built-in PLL to support inputting of master clock up to 20 MHz.
• Contains a 16-bit stereophonic D/A converter.
MIDI
U200
YMU762C-QZ
1
11
CLK1
HPOUT_R
4
10
_RST
HPOUT_L
30
A(1)
A0
31
12
_RD
_RD
EQ1
29
_CS
5
13
NC
EQ2
28
_WR
3
_IRQ
D(0)
27
14
D0
EQ3
26
2
D(1)
D1
LED
D(2)
25
19
D2
MTR
24
D(3)
D3
D(4)
23
D4
D(5)
22
17
D5
SPOUT1
D(6)
21
D6
D(7)
20
D7
R203 3.3K
6
18
PLLC
SPOUT2
9
VREF
32
15
SPVDD
IOVDD
7
VDD
8
16
VSS
SPVSS
Figure 22. MIDI sound Circuit
- 41 -
3. H/W Circuit Description
C200
22n
R200 36K
R201
39K
C201
22n
C203
47p
R202 120K
VIBRATOR
SPKP
SPKN
C205
10p
VBAT
MIDI_SPK_I
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Troubleshooting
