– 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) as operation mode setting data. Fig. 5-1 shows the internal communication between the 8-bit micropro-
cessor, ASIC and SPARC lite circuits.
Table 5-1. 8-bit Microprocessor Port Specification
8-bit
Microprocessor
ASIC
S. REQ
ASIC SO
ASIC SI
ASIC SCK
MAIN RESET
PLLEN
54
43
I
LCD backlight ON/OFF signal
44
LCD BL
O
Serial communication request signal
50
SREQ
XCIN
I
Clock oscillation terminal for clock (32.768 kHz)
52
53
NOT USED
O
-
BR PI E
I
Barrier motor PI input (interruption)
RESET
I
Microprocessor reset input
45
TH TEMP
I
Internal temperature detection
46
TIME OUT
I
Camera charging completed detection
47
NOT USED
O
-
48
BAT_TEMP
I
Battery temperature detection
51
SCAN IN 4
I
Key matrix input (interruption)
49
BAT_OFF
I
Battery OFF detection signal input
55
XCOUT
O
Clock oscillation terminal for clock (32.768 kHz)
56
VSS1
-
GND
57
XIN
I
Main clock oscillation terminal (4 MHz)
58
XOUT
O
Main clock oscillation terminal (4 MHz)
59
VDD1
-
VDD
60
BATTERY
I
Battery voltage detection
61
VMONIT
I
Main condenser charging voltage detection
62
TSEN_SENSE
I
Touch sensor detection
63
SO
O
Serial data output
64
SI
I
Serial data input
