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8##4#
- E5
㨯
E5400 -
1-3. SYA CIRCUIT DESCRIPTION
1. Con
fi
guration and Function
For the overall con
fi
guration of SYA block, refer to the block diagram. The 8-bit microprocessor (IC301) is the
center of the SYA block, which controls the camera system condition (mode).
The 8-bit-microprocessor handles the following functions.
1. Input of operation keys, 2. Control and backup of clocks, 3. Power ON/OFF, 4. Charge control of speed light,
5. Signal input/output for zooming and lens control
Pin
Signal
I/O
Outline
1
DC IN
I
External DC power detection
L: AC adapter
2
TEMP
I
A/D input (Lens temperature sensor)
3
RDY
I
Speed light charge detection
L: Charge
4
BATTERY
I
Battery voltage detection
5
AVREF
I
Analog reference voltage input terminal
6
BAT OFF
I
Battery OFF detection signal input
L: Without battery
7
SCAN IN0
I
Key matrix input (
↓
detection)
8
SREQ
I
Serial communication request signal
L: Request
9
ZPULSE1
I
Zoom motor drive pulse count (Interruption)
10
S2
I
S2 input (
↓
interruption)
L : S2 ON
11
Q0225/295
I
Q0225/Q0295 judgment
L : Q0225
12
CMD IN2
O
Command dial input 2 (Interruption)
13
BUZZER
O
BEEP output
14
VPP
-
Internal connection (Direct connection to VSS terminal)
15
XCOUT
O
Clock oscillation terminal
16
XCIN
I
Clock oscillation terminal
17
VSS1
-
GND
18
VDD1
-
VDD
19
XOUT
0
Main clock oscillation terminal
20
XIN
I
Main clock oscillation terminal (3MHz)
21
RESET
I
Reset input
L : RESET
22
RXD
I
Host wake up input terminal
23
USB CONNECT
I
USB power detection terminal (
↓
detection)
L: USB connection
24
㨪
25
NC
O
-
26
CAPH
-
-
27
CAPL
-
-
28
㨪
30
VLC 0~2
-
-
31
㨪
34
COM 1~4
O
-
35
SCOM0
O
-
36
㨪
47
S0~S11
O
-
48
㨪
49
SCAN OUT4~5
O
Key matrix output
50
SCAN IN2
I
Unused
51
NC
O
-
52
ZPLUSE2
I
Zoom motor drive pulse count
53, 54
ZM IN1~2
O
Zoom motor drive signal 1 ~ 2
55
ZRESET
I
Zoom reset input
56
㨪
59
SCAN OUT 0~3
O
Key matrix output
60
CMD IN1
I
Command dial input 1
61
COMREQ
I
Command request signal
62
SCAN IN1
I
Key matrix input
63
CHG ON
O
Speed light charge control
H: Charge
64
P ON
O
DC/DC converter (Digital system) ON/OFF signal H : ON
65
PA ON
O
DC/DC converter (Analog system) ON/OFF signal H : ON
66
LCD ON
O
LCD back light ON/OFF
H : ON
67
BL ON
O
Back light ON/OFF
H : ON
68
NC
I/O
-
(Continued on the following page.)