– 9 –
Fig. 5-1 Internal Bus Communication System
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, ASIC and SPARC lite circuits.
Table 5-1. 8-bit Microprocessor Port Specification
63
64
53
-
54
GND
59
ZAV JACK
I
AV JACK connection detection (L= connection)
VSS1
UNREG SY
I
Camera power voltage input
61
62
XOUT
O
Main clock oscillation terminal (4 MHz)
VDD1
-
VDD
51
KEY_POWER
I
Key input POWER
52
KEY_2ND
I
Key input 2nd SHUTTER
55
56
#RESET
I
Microprocessor reset input (L= reset)
57
XCIN
I
Sub clock oscillation terminal (32.768 kHz)
58
XCOUT
O
Sub clock oscillation terminal (32.768 kHz)
60
XIN
I
Main clock oscillation terminal (4 MHz)
8-bit
Microprocessor
ASIC
SREQ
ASIC SO
ASIC SI
SCK
MRST
43
KEY_MENU
I
Key input MENU
49
BAT_OFF
I
47
50
46
48
NOT USED
NOT USED
NOT USED
O
O
O
-
-
-
Battery OFF detection (L= battery OFF)
Serial communication request signal
ZSREQ
I/O
44
MR_TURN
I
LCD panel rotation detection (L= panel inversion)
45
NOT USED
O
-
PLLEN
TH_TEMP
I
Camera temperature detection
SO
O
Serial data output
SI
I
Serial data input
