Yamaha GX-505 Service Manual page 26

GX-505/GX-505VCD
IC8 : M38199EF [CD/VCD P.C.B.]
µ
8 bit -COM (CD CPU)
Pin No. Port
31 INT3
32 INT2
33 P41
INT0
34
35 /RESET
36 XCIN
37 XCOUT
38 XIN
39 XOUT
VSS
40
41 P27
42 P26
43 P25
44 P24
45 P23
46 P22
47 P21
48 P20
49 P17
50 P16
51 P15
52 P14
P13
53
54 P12
55 P11
56 P10
57 P07
58 P06
59 P05
60 P04
61 P03
62 P02
63 P01
64 P00
65 P37
66 P36
67 P35
68 P34
69 P33
70 P32
71 P31
72 P30
73 P97
74 P96
75 P95
76 P94
77 P93
78 P92
79 P91
80 P90
81 P87
82 P86
P85
83
84 P84
85 P83
86 P82
87 P81
88 P80
89 PA7
90 PA6
91 VCC
25
Name I/O
Open
/HINT I
Decoder interrupt signal
DEPH O
De-emphasis control
System µ-COM data automatic transfer initialize, start signal
/CSINT I
Reset
RESET I
XCIN Open
XCOUT Open
XIN I 8 MHz
O 8 MHz
XOUT
GND
GND
Not used
K3 I
K2 I Not used
K1 I Not used
K0 I Not used
O Not used
KD3
Not used
KD2 O
Not used
KD1 O
KD0 O Not used
O Not used
O Not used
O Not used
Not used
O
Not used
O
/DECRST O
Decoder reset
DRV O Servo driver on
FCSG O Focus gain high
O Tray open control signal
TROP
Tray close control signal
TRCL O
Tray table revolution
TBL + O
Tray table brake
TBL – O
Open
/MNRST O Servo LSI reset signal
O Open
Line mute
/MUTE O
Servo LSI power ON control
/PON O
Open
O
Digital mute
DMUTE O
/MLD O Microprocessor command store request
Serial 2 ^ µ-COM command
CMDSEL O
QSEL O
Serial 2 ^ Q-code reed
DOSEL O
Decoder serial I/O out select
Tray table revolution speed control
/TSPD O
VMUTE O
Video mute
O Not used
O Not used
O Not used
Not used
O
Not used
O
Not used
O
O Not used
O Not used
O Not used
Not used
O
Not used
O
Not used
O
Not used
O
Not used
O
O Not used
O Not used
O Not used
+5V
VCC
Function
(GX-505VCD only)
(GX-505VCD only)
(MAIN CLOCK)
(MAIN CLOCK)
(GX-505VCD only)
(NC)
(implied clamper control)
(GX-505VCD only)
(H : Low speed)
(GX-505VCD only)