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1-5. SYA CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SYA block, refer to the block diagram. The configuration of the SYA block centers around a 8-
bit microprocessor (IC301).
The 8-bit microprocessor handles the following functions.
1. Operation key input, 2. Clock control, 3. Power ON/OFF, 4. Storobe charge control
Pin
Signal
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
24
26
27
28
29
30
31
32
33
34
35
36
37
39
41
38
40
SCK
BACKUPCTL
NAND RESET
BAT_T_V
NOT USED
TSEN_PULSE
NOT USED
LCD_PWM
VDD
SELF_LED
CARD ON
NOT USED
MRST
NOT USED
NOT USED
NOT USED
UTX
SCAN IN2
NOT USED
KEY_2nd
P ON
BL ON
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
VSS3
RDSEL
CLK
DATA0
I/O
O
O
O
O
-
O
-
O
I
O
O
-
O
-
-
-
O
I
-
I
O
O
-
-
-
-
-
-
-
I
I
I
Outline
Serial clock output
Backup battery charge control (L= charge)
OneNAND flash memory reset
T terminal power
-
Touch sensor pulse output
-
LCD PWM
Power
Self timer LED (L= lighting)
Card detection pull-up output
-
System reset
-
-
-
UART sending (for debugger)
Keymatrix input (using built-in pull-up)
-
2nd switch (using built-in pull-up)
Digital system power on control
LCD backlight power on signal
-
-
-
-
-
-
GND
Microprocessor rewrite port
Microprocessor rewrite port
Microprocessor rewrite port
10
VSS
-
GND
21
USB_CONNECT
I
USB power detection terminal (L= detection, using built-in pull-up)
22
SCAN IN0
I
Keymatrix input (using built-in pull-up)
23
SCAN IN1
I
Keymatrix input (using built-in pull-up)
25
SCAN IN3
I
Keymatrix input (using built-in pull-up)
43
SCAN OUT3
O
Keymatrix output
42
CHG
O
Strobo charge control (H= charge)
PLLEN
O
PLL oscillation control signal
VDD3
I
Power
SCAN OUT2
O
Keymatrix output
SCAN OUT1
O
Keymatrix output
