Nikon coolpix L100 Repair Manual page 71

44 NOT USED
45 COMREQ/ZBOOT
46 BACKUP_CTL
47
NOT USED
48
NOT USED
49
BAT_OFF
50
SREQ
51
SHUTTER 2nd
52 HOTLINE
53
RESET
54
XCIN
55
XCOUT
56
VSS1
57 XIN
58
XOUT
59
VDD1
60 BATTERY
61 VMONIT
62
TEMP
63
SO
64
SI
2. Setting of external port and communication
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. 4-1 shows the internal communication between the 8-bit micropro-
cessor and ASIC.
8-bit micro processor
-
-
I Command request (BOOT output)
O Backup battery charge control
-
-
- -
I
Battery OFF (removal) detection
I Serial communication request signal
I Shutter 2nd key detection
ASIC directly
I
I Backup reset detection
I Clock oscillation terminal for clock (32.768 kHz)
Clock oscillation terminal for clock (32.768 kHz)
O
- GND1
I Not used for using built-in oscillation circuit
O
Not used for using built-in oscillation circuit
- Power 1
I Battery voltage monitoring
I Strobo condensor charging voltage monitoring
I
Camera (SD) temperature monitoring
O Serial data output
I Serial data input
Table 4-1. 8-bit Microprocessor Port Specification
MAIN RESET
PLLEN
SREQ
ASIC_SDO
ASIC_SDI
SCK
COMREQ
REFE_CTL
Fig. 4-1 Internal Bus Communication System
– 8 –
- E7 ･ L100 -
INC
VMA43007-R.3780.A
ASIC