Sanyo VAR-G6E, Service Manual

Page: 8 / 49

– 8 –
Fig. 5-1 Internal Bus Communication System
Table 5-2. Key Operation
2. Internal Communication Bus
The SY1 circuit board carries out overall control of camera operation by detecting the input from the keyboard and the condition
of the camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data
to the camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 5-1 shows the internal communi-
cation between the 8-bit microprocessor, ASIC and SPARC lite circuits.
3. Key Operaiton
For details of the key operation, refer to the instruction manual.
Table 5-1. 8-bit Microprocessor Port Specification
63
64
ASIC TEST 2
ASIC RESET
O
O
ASIC reset control signal 2
ASIC reset singal
61
62
51
I
Buzzer beep tone output H : Pulse output
52
BUZZER O
USB connector detection L : USB detecion 57
ASIC TEST 1
O ASIC reset control signal 1
USB
ASIC TEST 0 O ASIC reset control signal 0
59
60
CARD I CF card insertion detection L : Insertion
NTZPAL O NTSC/PAL switch H : NTSC
BACKUP_CNT
O
Backup battery charge control L : Charge ON
49 AV JACK I AV jack connection detection H : AV jack detection
50
DC IN O DC jack/battery detection input (analog input) L : DC jack insertion
53 SCAN OUT 4 I Key scan output 4
54 SCAN IN 4 O Key scan input 4
55 SCAN IN 5 I Key scan input 5
56
SUB1
I/O
Communication line to main
58
LCD ON2 O LCD ON/OFF control 2 H : ON
8-bit
Microprocessor
ASIC
S. REQ
ASIC SO
ASIC SI
ASIC SCK
ASIC RESET
ASIC TEST 1
ASIC TEST 2
ASIC TEST 0
1
2
0
1
2
3
SCAN
OUT
SCAN
IN
←
LEFT
-
DC MODE
LCD
TEST
→
RIGHT
WIDE
FOCUS
↓
DOWN
3 WEB
-
SET UP
4
MENU
TELE
VIDEO CLIP
SHOOTING
↑
UP
-
4
-
VF PLAY
-
FLASH
SEQUENTIAL
SHOT
-
5
SET
-
1st
STILL IMAGE
-
6
-
-
2nd
-
POWER ON
-
0