6 - 56
2.
System Control Microprocessor (IC901: S-µP)
Pin
I/O
Active
Abbreviation
Function
No.
Level
1
O
Lo
CH2. REC[Lo]
Output the signals to select the video heads for recording.
2
O
Lo
CH1. REC[Lo]
Go "Lo" in the corresponding channel period during recording.
3
O
(Pulse)
SW30[Lo]
Antiphase head switching pulse output.
4
O
(Pulse)
SW30
Head switching pulse output.
5
I
Hi
TEST/NOR[Lo]
Test program start detection input. A test program is executed when "Hi" is input.
6
O
Hi
FMAG1
Q0114 (FM AGC) control outputs. Q0114 aligns the REC AUDIO signal (FMA) level
35
O
Hi
FMAG2
with the REC VIDEO signal level that varies.
7
I
Hi
ADP_DET
AC adapter connection detection input.
8
I
Hi/Lo
PRE_V
Lithium battery attachment and voltage detection input.
(Not attached or less than 2.5V: Hi, Attathed: Lo)
9
I
Lo
EXT_BATT
Battery attachment detection input.
10
I
0V-3V
M-SW2
Mechanism state switch position (mode) detection input.
11
I
0V-3V
M-SW1
12
I
0V-3V
M-SW0
13
I
Lo
CAM.SW[Lo]
Power switch detection input. "Lo" is input during recording (CAMERA mode).
14
I
Lo
VCR.SW[Lo]
Power switch detection input. "Lo" is input during playback (PLAY mode).
15
I
Lo
EJECT[Lo]
Eject switch detection input. When "Lo" is input, the camera/recorder performs the
eject operation even when the power is turned off (standby release input).
16
I
Lo
STAGE[Lo]
Cassette holder open/close detection input. "Lo" is input when the cassette holder
is closed.
17
I
Hi/Lo
ME/MP[Lo]
Input to discriminate the type of tape.
Hi: ME (metal evaporated) tape, Lo: MP (metal particle) tape.
18
I
Lo
WAKE UP[Lo]
Standby release input. When the camera power is turned on, "Lo" is input to
release the standby mode. IC0901 detects the inputs of each switch to start
operation.
19
I
Lo
REC START[Lo] Recording start/stop switch detection input.
20
-----
-----
----------
Not used. Open.
21
O
Hi
CHARGE_CONT Controls IC0553 (5V REG) to generate autofocus and charge circuits power supply
5V(AF).
22
O
Hi
INIT_CHG
Charge mode control output. Outputs "Hi" when the voltage of the attached battery
is 5.8V or less, to set the camcorder to the initial charge mode.
23
O
Hi
CHG_LED
Outputs "Hi" during charging to control Q0732 (CHG LED DRIVE) so that the
CHARGE LED (LED0751) lights.
24
-----
-----
----------
Not used.
25
O
Hi
MUTE
Audio muting output. Outputs "Hi" to mute sound.
26
O
Hi/Lo
CAM[Lo]/LINE
Video processor mode control output. Outputs "Lo" during camera recording and
"Hi" with an external (line) signal.
27
O
(Pulse)
END LED
End LED drive output. Outputs pulses of approx. 50Hz when power is turned on.
28
O
Hi
VCR ON
Power control output. Outputs "Hi" when power is turned on.
29
O
Lo
CAM+OSD
Outputs "Lo" with power on and is set to open with power off to initialize IC1104
RESET[Lo]
(DIGITAL µ P) and IC0904 (CHARA. GEN.).
30
O
(Pulse)
CEVF_CS
Not used.
31
O
Hi
C.STANDBY
Capstan motor power control output.
32
O
Hi/Lo
ZONE. OFF
Not used.
33
O
Hi
Hi-8_ET
Not used.
34
O
Lo
DSP RESET
Outputs "Lo" with power on and is set to open with power off to initialize IC0201
[Lo]
(VIDEO DSP).
36
-----
-----
----------
Not used. Open.
37
-----
-----
GND
Grounded.
38
I
Lo
SYSTEM
Microprocessor reset input. "Lo" input resets the microprocessor.
RESET[Lo]
39
-----
-----
GND
Grounded.
