ST7920 LCD Graphic 12864 Serial Mode

Pinout:
GND VCC V0 RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 PSB NC RST VOUT BLA BLK
- GND = 0V
- VCC = 5V
- RS = CS, active high
- R/W = SID
- E = SCLK
- PSB = 0V
- BLA = 3V3
- BLK = 0V

Init:
- SendCmdBits(0 0 1 1 0 0 0 0) # 8-bit, basic
- SendCmdBits(0 0 1 1 0 0 0 0) # 8-bit, basic
- SendCmdBits(0 0 0 0 1 1 0 0) # display-on, no-cursor, no-blink
- SendCmdBits(0 0 1 1 0 1 0 0) # 8-bit, extended
- SendCmdBits(0 0 1 1 0 1 0 0) # 8-bit, extended
- SendCmdBits(0 0 1 1 0 1 1 0) # 8-bit, extended, graphic

The Address Coordinates (Y,X):
-------------------------------Look carefully!
 (0,0) (0, 1)....(0, 7)
 (1,0) (1, 1)....(1, 7)
.......................
(31,0)(31, 1)...(31, 7)
 (0,8) (0,17)....(0,15)
 (1,8) (1,17)....(1,15)
.......................
(31,8)(31,17)...(31,15)

Every (Y,X) is 16-bit data:
  D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Goto address(Y,X):
- SendCmdBits(1 0 Y5 Y4 Y3 Y2 Y1 Y0)
- SendCmdBits(1 0 0 0 X3 X2 X1 X0)

Set 16-bit data:
- SendDataBits(D15 D14 D13 D12 D11 D10 D9 D8)
- SendDataBits(D7 D6 D5 D4 D3 D2 D1 D0)
- The address automatically become (Y, (X+1) MOD 16)

SendCmdBits(D7 D6 D5 D4 D3 D2 D1 D0):
- CS = HIGH
- SendBits(1 1 1 1 1 0 0 0)
- SendBits(D7 D6 D5 D4 0 0 0 0)
- SendBits(D3 D2 D1 D0 0 0 0 0)
- CS = LOW

SendDataBits(D7 D6 D5 D4 D3 D2 D1 D0):
- CS = HIGH
- SendBits(1 1 1 1 1 0 1 0)
- SendBits(D7 D6 D5 D4 0 0 0 0)
- SendBits(D3 D2 D1 D0 0 0 0 0)
- CS = LOW

SendBits(B7 B6 B5 B4 B3 B2 B1 B0):
- SID = B7
- SCLK = HIGH
- SCLK = LOW
............
- SID = B0
- SCLK = HIGH
- SCLK = LOW

If your microcontroller is too fast, add delay.
If not displaying, turn the potentiometer to adjust contrast?