– 10 –
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
-
Sub clock (32.768 KHz)
54
XCIN
I
VDD
59
ASIC SO
I
Serial data input
VDD1
ASIC SI
O
Serial data output
61
62
RESET
I
Reset input (L= reset)
NOT USED
O
-
TH_TEMP
I
Camera temperature detection (analog input)
51
KEY_POWER
I
Key input POWER (L= input)
52
KEY_2ND
I
Key input 2nd SHUTTER (L= input)
55
XCOUT
O
Sub clock (32.768 KHz)
56
VSS1
-
GND
57
XIN
I
Main clock (4 MHz)
58
XOUT
O
Main clock (4 MHz)
60
BATTERY
I
Battery voltage detection (analog input)
8-bit
Microprocessor
ASIC
SREQ
ASIC SO
ASIC SI
SCK
MRST
43
KEY_MENU
I
Key input MENU (L= input)
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
SREQ
I
44
KEY_1ST
I
Key input 1st SHUTTER (L= input)
45
NOT USED
O
-
PLLEN
TRST
