Hitachi VK-U174 Service Manual page 18

Description of Operation > Microprocessor Pin Function Table
Pin
Abbreviation
I/O
No.
39 FCUS-SEN I
40 NC5 -----
41 ZOOM-SEN I
42 GND2 -----
43 HALL-ADJ1 O
44 HALL-ADJ0 O
45 BATTERY I
46 KEY-AD0 I
47 KEY-AD1 I
48 +B-DET I
49 TEMP-ADJ I
50 KEY-AD2 I
51 KEY-AD3 I
52 FDET I
53 AVCC1 -----
54 AVCC2 -----
55 VCC2 -----
56 VCC3 -----
57 NC7 -----
58 NC8 -----
59 RESET-IN I
60 VCC4 -----
61 STBY -----
62 VCC5 -----
63 XTAL I
65 EXTAL O
64 GND3 I
66 FWE I
67 MD2 I
68 NC9 -----
69 HALL-G O
70 NC10 -----
71 NC11 -----
72 HD I
73 NC12 -----
74 NC13 -----
75 FP I
76 SD O
77 RD I
78 EP3 I
79 NC14 -----
80 NC15 -----
Active
Level
Pulse Focus motor position detection input.
----- Not used. Open.
Pulse Zoom motor position detection input.
----- Ground.
0V-3V Controls the offset voltage of IC4101 (F-DET).
0V-3V Controls the bias voltage of the Hall devices via Q4101 (BIAS GEN.)
and Q4103 (BIAS DRIVE)
0V-3V Not used. Connected to 3V line and ground via resistors.
0V-3V Operation switch detection input.
0V-3V
0V-9V Power voltage (+B) detection input. Monitors the +B line voltage.
0V-3V Temperature change detection input. Detects variations in the
forward voltage at the connected diode to correct the back-focus.
0V-3V Operation switch detection input.
0V-3V
0V-3V F-value detection input. Receives the F-DET voltage detected by
IC4101 (F-DET) and compares this with the reference voltage input
via pin 53 to detect the F-value.
----- Reference 3V power input.
----- A/D reference voltage input (connected to 3V power supply).
----- 3V power input.
-----
----- Not used. Open.
----- Not used. Connect to ground.
Lo Reset signal input from IC2302 (RESET PULSE GEN.).
----- 3V power input.
----- Not used. Connect to 3V power supply.
----- 3V power input.
Pulse Drive X2301 to generate 13.5MHz main clock pulses.
Pulse
----- Grounded.
0V-3V Pins for writing microprocessor program: Exclusive use at the factory.
0V-3V
----- Not used. Open.
Hi Controls the amplification (gain of Hall device) of IC4102 (HALL
AMP).
----- Not used. Open.
-----
Pulse Inputs horizontal sync from IC2052 (CAMERA DSP).
----- Not used. Open.
-----
Pulse Inputs field discrimination pulse from IC2052 (CAMERA DSP).
Pulse Used for initial settings and adjustment. For data communications
Pulse with personal computer.
Pulse Receives pulses which discriminate the iris detection area.
----- Not used. Open.
-----
3 - 3
Function