Sanyo VPC-E10 Service Manual page 10

44 SCAN OUT0
45 ZBOOT_COMREQ
46 CHG_DONE
47
CARD
48 AV JACK
49
BAT_OFF
50
SREQ
51 KEY_POWER
52
KEY_1st
53
RESET
54
XCIN
55 XCOUT
56
VSS
57
XIN
58
XOUT
59
VDD1
60
UNREG_SY
61
TOUCH_IN
62
BAT_T
63
ASIC_SDI
64 ASIC_SDO
2. Internal Communication Bus
The SYA block 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 communication
between the 8-bit microprocessor and ASIC.
8-bit micro processor
setting of
external port
communi-
cation
O Keymatrix output
BOOT input or COMREQ output
O
I Strobo condensor charge done (L= done)
I Card detection (L= card detection)
I AV jack detection (L= detection)
Battery OFF detection signal input
I
I
Serial communication request signal
Power key detection (using built-in pull-up)
I
I
1st switch input (using built-in pull-up)
I Reset input
Clock oscillation terminal for clock (32.768 kHz)
I
O Clock oscillation terminal for clock
- GND
Clock oscillation terminal (connect to BACKUP 3.2 V)
I
Clock oscillation terminal (NOT USED)
O
I Power
Battery voltage detection
I
I Touch sensor voltage input
T terminal voltage input
I
Serial data output
O
Serial data input
I
Table 5-1. 8-bit Microprocessor Port Specification
MRST
PLLEN
ASIC_SDI
ASIC_SDO
SCK
SREQ
COMREQ
Fig. 5-1 Internal Bus Communication System
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ASIC