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5-6. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN FUNCTION (MA-325 BOARD IC161)
Pin No.
Pin Name
I/O
1
RF SWP
O
RF switching pulse output
2
AF REC P
O
"L" output when hi-fi audio REC pause
3
N.C
–
Not used
4
QVD
O
Quasi VD pulse output
5
N.C
–
Not used
6
N.C
–
Not used
7
REC CTL
O
REC CTL signal output
8
CTL RESET
I
CTL reset (for check)
9
CAM
O
CAM motor control
10
N.C
–
Not used
11
N.C
–
Not used
12
N.C
–
Not used
13
NT JUDGE
–
Not used
14
MESECAM DET
–
Not used
15
CIN (REC PRF)
I
Erasing protection tab. Cassette in detection.
16
N.C
–
Not used
17
N.C
–
Not used
18
N.C
–
Not used
19
MODE 4
I
Mechanism section CAM encoder input (data4)
20
MODE 3
I
Mechanism section CAM encoder input (data3)
21
MODE 2
I
Mechanism section CAM encoder input (data2)
22
MODE 1
I
Mechanism section CAM encoder input (data1)
23
N.C
–
Not used
24
N.C
–
Not used
25
N.C
–
Not used
26
TV/VTR
O
RF-output control
27
N.C
–
Not used
28
SDA 0
I/O
Video Audio (Normal & Hifi) block communication signal (IIC DATA)
29
N.C
–
Not used
30
SCL 0
O
Video Audio (Normal & Hifi) block communication signal (IIC CLOCK)
31
A MUTE
O
"A" Audio mute signal output
32
T/S LED
O
Top/End LED ON/OFF control
33
N.C
–
Not used
34
N.C
–
Not used
35
CAP STOP
O
Capstain motor stop control
36
FULL ERASE
O
Full erase head control
37
N.C
–
Not used
38
N.C
–
Not used
39
MP
I
Fixed to L
40
ASURA RESET
I
System reset input
41
V ss
–
Ground
42
XTAL
–
System clock 16MHz
43
EXTAL
–
System clock 16MHz
44
ASURA CS
I
S/S microcomputer chip signal
45
S IN
I
Serial communication signal (Data input)
46
S OUT
O
Serial communication signal (Data output)
47
S CLK
O
Serial communication signal (Serial clock)
48
N.C
–
Not used
49
N.C
–
Not used
50
N.C
–
Not used
Function
Pin No.
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Pin Name
I/O
N.C
–
Not used
AVSS
–
UNSW Ground
AVREF
–
A/D port reference input UNSW 5V
AVDD
–
UNSW 5V
NT PB SW
I
Not used (Pull up 5V)
AV ADJ
I
HiFi/RF switching adjustment mode
N.C
–
Not used
N.C
–
Not used
AF ENV
I
HiFi audio playback signal envelope
RF ENV
I
Video playback signal envelope
T SENS
I
Take up end sensor input
S SENS
I
Supply end sensor input
SREEL FG
I
S side reel FG input
TREEL FG
I
T side reei FG input
N.C
–
Not used
V SYNC
I
Composite sync input
PB CTL
I
Playback CTL input
DRM PG
I
Drum PG input
DRM FG
I
Drum FG input
CAP FG
I
Capstan FG input
N.C
–
Not used
CAP RVS
O
Capstan reverse control H when Reverse
CAP DA
O
Capstan error D/A output
DRM DA
O
Drum error D/A output
N.C
–
Not used
N.C
–
Not used
REC CONT
I
Record count input
N.C
–
Not used
N.C
–
Not used
SO1
O
Signal for serial communication (data output)
SCK1
O
Signal for serial communication (clock)
N.C
–
Not used
N.C
–
Not used
CAP TRQ PWM
O
Capstan TRQ PWM output
N.C
–
Not used
N.C
–
Not used
N.C
–
Not used
VSS
–
Ground
VDD
–
5V
N.C
–
Not used
N.C
–
Not used
CTLHYS HIGHT
O
CTL amp. Step control (Hi)
IN SEL1
O
LINE-INPUT selection control signal-1
N.C
–
Not used
N.C
–
Not used
AF REC
O
"H" output when Hifi audio REC
N.C
–
Not used
N.C
–
Not used
STEP PLS
O
Step pulse "H" when Capstan step driving
AF SWP
O
AF switching pulse output
Function
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