Hi XiangJun,
The pins in your document do not match the display ribbon or the circuit diagram on the OM13082 board.
There is no evidence of LEDA/LEDK on the OM13082 board connector. There are 20 pins on the LCD and 28 pins on the external end of the ribbon cable. The unused 8 pins are connected to capacitors on the OM13082 board (presumably for a different LCD display).
Here are the pins:
LCD12864 ribbon FPC-WKG12864...
ST7565S controller
OM13082 OM13082
LCD side external connector connector CCT
======== ======================= ========= =======
1 CS 1 CS R8 -> CS
2 /RES 2 RST nRST
3 CD 3 C/D R11 -> CD
4 4 WR (NC)
5 5 RD (NC)
6 D0 6 D0 (NC)
7 D1 7 D1 (NC)
8 D2 8 D2 (NC)
9 D3 9 D3 (NC)
10 D4 10 D4 (NC)
11 D5 11 D5 (NC)
12 D6(SCL) 12 D6/SCK SCLK
13 D7(SI) 13 1 - 13 = thin wires D7/SID MOSI
14 VSS 14 Thick wire VSS GND
17 VOUT 15 VOUT C20 -> GND
16 NC CAP3P C14
17 NC CAP1N C14/C18
18 NC CAP1P C18
15 19 CAP2P C19
16 20 CAP2N C19
21 NC V4 C13 -> VDD
22 NC V3 C12 -> VDD
23 NC V2 C11 -> VDD
24 NC V1 C10 -> VDD
25 NC V0 C9 -> VDD
18 C86 26 L:C86/H:C68 VDD MPU interface. H = 6800 series. L = 8080.
19 P/S 27 L:S/H:P GND L = serial (SCL/SI)
20 28 Thick wire VDD VDD VDD
Thanks.
John.
