Hitachi VK-S274R Service Manual page 13

Description of Operation > Microprocessor Pin Function Table
Pin Active
I/O Abbreviation
No. Level
38 I (Pulse) FV
39 I (Pulse) FCUS-SEN
40 ----- ----- NC2
41 I (Pulse) ZOOM-SEN
42 ----- ----- GND2
43 O 0V-3V HAL-ADJ1
44 O 0V-3V HAL-ADJ0
45 I 0V-5V 5V_DET
46 I 0V-3V ZOOM-SW
47 I 0V-3V FOCUS-SW
48 I 0V-3V +B_DET
49 I 0V-3V TEMP-ADJ
50 I 0V-3V V-GYRO
51 I 0V-3V H-GYRO
52 I 0V-3V FDET
53 ----- ----- AVCC1
54 ----- ----- AVCC2
55 ----- ----- VCC2
56 ----- ----- VCC3
57 ----- ----- NC4
58 ----- ----- NC5
59 I Lo SYS-REST
60 ----- ----- VCC4
61 ----- ----- STBY
62 ----- ----- VCC5
63 I (Pulse) XTAL
64 ----- ------ GND3
65 O (Pulse) EXTAL
66 I Lo FWE
67 I Hi MD2
68 ----- ----- NC6
69 O Hi HALL-G
70 ----- ----- NC7
71 ----- ----- NC8
72 I (Pulse) HD
73 ----- ----- SHUT-CTL
74 ----- ----- STROBE
75 I (Pulse) FP
76 O (Pulse) SD[232C]
77 I (Pulse) RD[232C]
78 I (Pulse) EP3
Receives the vertical sync pulses that detect the iris detection area,
from IC1121 (CAMERA DSP).
Focus motor position detection input.
Not used. Open.
Zoom motor position detection input.
Ground.
Controls the offset voltage of IC1351 (F.DET/IRIS DRIVE).
Drives bias generator in IC1351 (F.DET/IRIS DRIVE) via Q1351
(BIAS DRIVE) to control the bias voltage of the Hall devices.
DC5V detection input. Monitors the 5V line voltage.
Not used.
Power voltage (+B) detection input. Monitors the +B line voltage.
Temperature change detection input. Detects variations in the
forward voltage at the connected diode to correct the back-focus.
Not used. Connect to ground.
F-value detection input. Receives the F.DET voltage detected by
IC1351 (F.DET/IRIS DRIVE) 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.
Reset signal input from IC1206 (RESET PULSE GEN.).
3V power input.
Not used. Connect to 3V power supply.
3V power input.
Not used. Open.
Grounded.
Inputs controk pulses from IC1211 (CAMERA DSP).
Not used.
Not used. Open.
Controls the amplification (gain of Hall device) of IC1351 (F.DET/IRIS
DRIVE).
Not used. Open.
Inputs horizontal sync from IC1121 (CAMERA DSP).
Not used. Open.
Inputs field discrimination pulse from IC1121 (CAMERA DSP).
Used for initial settings and adjustment. For data communications
with personal computer.
Receives pulses which discriminate the iris detection area.
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Function