Sanyo VPC-J4 Service Manual page 6

1-5. SYA CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.
1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.
Pin Signal
AVREF
1
2 AVSS
IC
3
4
VDD
5 REGC
6
VSS
XIN
7
8 XOUT
9 RESET
10
XCIN
11 XCOUT
12 CLKSEL0
13 BAT_OFF
14 NC
15
USB_DET
16 BR_OPEN
17 SREQ
BACKUP_CTL
18
19
LCD ON3
20 FLMD1
21 LCD ON2
22 LCD ON
23 BLON
24 NC
25 PRG SO
26 PRG SI
27 PRG SCK
28 MAIN RESET
29 NC
30 VF. LED (R)
31 VF. LED (G)
32
VSS
33 VDD
34 P ON
35
PA ON
36 SCK
SI
37
38 SO
39 CHG ON
40 FLMD0
41 NC
42~44
SCAN OUT 2~0
I/O
Analog standard voltage input terminal
I
GND
-
- Power for program writing
VDD
-
- Regulator output stability capacity connection
- GND
I Main clock oscillation terminal (4MHz)
Main clock oscillation terminal
-
I
Reset input
I Clock oscillation terminal (32.768 kHz)
-
Clock oscillation terminal
O ARM system clock ON/OFF
I Battery off detection signal input
O (Output mode "0" fixing)
USB power detection terminal ( ↓ detection)
I
Manual barrrier detection ( ↓ detection)
I
I Communication transmission clock (SY-ASIC)
Backup battery charge control (L= charge)
O
D/D converter (LCD system) ON/OFF signal 3
O
Flash writing control 1
O
D/D converter (LCD system) ON/OFF signal 2
O
D/D converter (LCD system) ON/OFF signal 1
O
LCD backlight ON signal (H= lighting)
O
O (Output mode "0" fixing)
O Serial data output for flash
I Serial data input for flash
O Serial clock output for flash
O System reset (MRST)
(Output mode "0" fixing)
O
O VF LED (red) (L= lighting)
VF LED (green) (L= lighting)
O
- GND
- VDD
O
D/D converter (digital system) ON/OFF signal
O D/D converter (analog system) ON/OFF signal
O Serial clock output
Serial data input
I
O Serial data output
Strobe charge control
O
Flash writing contol 0
O
O (Output mode "0" fixing)
O Key matrix output
– 6 –
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