Nokia 1100 LCD Interfacing with Microcontroller

 Displaying content on a normal alphanumeric display is very limited ,we have to be limited with the font size and we can't draw any graphics also. but convention Graphics lcd are really very expensive so here is the solution, you can use Nokia 1100 monochrome  LCD to display your large font text and graphics . the reason behind using this LCD is ,it is really very cheap and can be powered with 3 volts supply. so it is really good for battery powered application.

      Driver IC on this LCD panel is PCF8814 which even though has I2C protocol support - doesn't use it. Instead it uses simple bit-banging mechanism for communication.

Project Description 

       however you can use almost any microcontroller (need a little bit extra circuit to work with mcu who doesn't support 3v) do display content on this LCD, may be that micro controller is PIC , AVR or MSP 430 ,8051 but in this demonstration we will be using Microchip PIC 18F458 Microcontroller.

    The software program for this project will be written in C with MPLAB IDE , This LCD has a resolution of 96 x 65 pixels

Nokia 1100 LCD Pinout

About LCD:-

       Nokia 1100 Graphical LCD uses PCF8814 Controller chip From Philips. It is a chip-on glass(COG) with  9 pin (pin no 9 is not used) connector on the back side of the LCD . You can refer to its datasheet for more information about this controller. (CLICK HERE TO DOWNLOADPCF8814 Controller DATA SHEET).we will discuss only few main points here for out project purpose.

       This LCD has  96 x 65 pixels , which mapped directly in the ram memory of the LCD, as shown in the figure blow

The typical example of RAM is shown in the figure blow, The vertical axes area addressed form 0 to 8 with eight bits for each address when combining with x axes, it can be represented as bank.

The horizontal axes are addressed form 0 to 83 and each bit will refer the corresponding pixel in X direction.

Addressing Mode

 There are two type of addressing mode in this LCD

Vertical addressing Mode

  In vertical addressing Mode each write instruction will increment the address in Y direction and then return to starting address

Horizontal addressing

horizal addressing each wire instruction will increment the address of X direction and return to starting address

INSTRUCTION SET OF PCF8814

NOTE :- PLEASE REFER TO DATA SHEET of PCF8814 for more detailed instructions

Serial Communication

  A byte is sent to The LCD as follows:-

1:- Set SC to GND

2:- Set SCLK to GND

3:- Put the D/C bit (Data or command) to SDA

4:- Set SCLK to 1

5:- set SCLK to 0

6:- put the data bit to to SDA

7:- set SCLK to 1

8:- Repeat step 5,6 and 7 for the remaining seven bits.

The initialization sequence of  LCD

1. Pull CS line to Ground to Enable The LCD.

2 Set RST pin to Low

3. wait For a liitle while ~ 5mS.

4.Set RST pin to high.

5. Write Command 0x20 Byte to LCD on the serial Bus. Write Vop register

6. Write Command 0x90 Byte to LCD on the serial Bus.

7. Write Command 0xA4 Byte to LCD on the serial Bus.  all on/normal display

8.  Write Command 0x2F Byte To LCD on the serial Bus.  Power control set(charge pump on/off)

9.  Write Command 0x40  Byte To LCD on the serial Bus.  set start row address = 0

10. Write the Command 0xB0 Byte to LCD on tee serial Bus. set Y-address = 0

11. Write the Command 0x10 Byte to LCD on tee serial Bus. set X-address, lower 3 bits

12. Write the Command 0x00 Byte to LCD on tee serial Bus. set X-address, upper 3 bits

14. Write the Command 0xC8 Byte to LCD on tee serial Bus. mirror Y axis (about X axis)

15. Write the Command 0xA1 Byte to LCD on tee serial Bus. Invert screen in horizontal axis

16. Write the Command 0xAC Byte to LCD on tee serial Bus. set initial row (R0) of the display

17. Write the Command 0x07 Byte to LCD on tee serial Bus.

18. Write the Command 0xF9 Byte to LCD on tee serial Bus. 

19. Write the Command 0xAF Byte to LCD on tee serial Bus. display ON/OFF

20:- clear the LCD

21:- Write the Command 0xA7 Byte to LCD on tee serial Bus. Invert the display

22:-wait for 500 ms

23:-Write the Command 0xA7 Byte to LCD on tee serial Bus. Normal  the display

clearing the LCD,  after initialization pull SCE pin to ground to enable the LCD.Set D/C pin to high to send the data to the LCD.  Repeat  "write byte 0x00" operation to the LCD for 864 times thi will turn off all the pixels in the LCD.

Assembling the Circuit

    The circuit is very easy to understand. but  the only precaution which need to be taken care is soldering the  wire to the LCD is very complex job.and you can't supply more than 3 volts  , please not that 5 volts may blow up the LCD  My prototype image shown blow

Software 
 The software program is written in C with the help of MPLAB and Microchip C18 compiler 

Click here to Download the software source code and ready to run firmware 

if some body sill have any question please let me know