assembly code for lcd display pricelist

The screen worked, but if I had to do it again, I wouldn"t! As can be seen in the photos, it is necessary to relocate your old home button to the new screen - remove two screws and carefully remove the cable held in place with adhesive, then reinstall in the new screen. That"s not the hard part, though. This model also requires you to remove your old camera, proximity sensor, speaker, light filter, camera mounting bezel, proximity bezel, and their respective miniature gaskets, and place them all back onto the new face plate, without ripping the cable attached to the digitizer. In the way my daughter broke her screen, the camera holder was already in pieces (the camera still worked fine, though). The proximity holder broke when I tried to remove it. I can"t imagine the frustration of trying to glue these two pieces back in place by hand, considering the size of the pieces and the minute tolerances to make everything fit correctly. Honestly, I don"t see why these replacements don"t already have these small clear plastic items factory installed. I gave up on my "fragments", and reassembled the phone without them. It seems to work fine now, but if it fails, I"ll just order a screen with the "small parts" already installed. I wish I had known the difference before tackling this project. It would have saved me a LOT of frustration and time. The pre-assembled unit would have only required me to remove two screws to open the case, then 4 screws over the cable retainer. From there, pop off the three cables, then reassemble in reverse - so much easier and faster, as in minutes, not hours. (HINTS - there is no need to remove the SIM card. Also, if you want to disconnect the battery, you can remove just one screw and loosen the other, then swivel the battery cable clip out of the way; much easier to reinstall that way. Some repair videos don"t show disconnecting the battery at all, but I was being cautious.) Over the years, I"ve replaced a lot of camera, phone, and laptop screens. This screen replacement ranked as one of the harder ones, and needlessly so.

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HD44780 based character LCDs require at least 6 I/O lines from microcontroller to display data. Therefore, they are not suitable for low-pin microcontrollers like PIC12F series microchips. In this project, I am going to show how to drive an HD44780 based LCD display with only 3 pins of a microcontroller. I am going to demonstrate it with PIC12F683 microchip. The character data and command from the microcontroller is transferred serially to a shift register (74HC595), and the parallel output from the shift register is fed to LCD pins.

In this project, SH_CP and ST_CP are tied together. So, if we want to receive a serially transferred 8-bit into parallel form at Q0-Q7, an extra clock pulse is required after transmitting the 8-th bit of serial data because the clocks are tied and the storage register is 1-clock behind the shift register.

All HD44780 based character LCD displays are connected using 14 wires: 8 data lines (D0-D7), 3 control lines (RS, E, R/W), and three power lines (Vdd, Vss, Vee). Some LCDs may have LED backlight and so they may have additional connections (usually two: LED+ and LED-).

Providing detail explanation of individual LCD pin doesn’t fall within the scope of this project. If you are a beginner with LCD, I recommend to read these two articles first from Everyday Practical Electronics magazine : How to use intelligent LCDs

The hardware part of this project is fairly simple. The challenging part is to write the driver software that is responsible for a proper sequence of operations required to serially transfer character data and command to 74HC595 serial-in parallel-out shift register. The shift register parallel output is then connected to LCD data lines (D4-D7) and RS control pin. This arrangement requires 3-pins of microcontroller to display character data on a parallel LCD display: 2 pins for providing Clock and Data to 74HC595, and 1 pin for enable control (E) pin of LCD module. Since the data transfer uses 4-bit mode, any 8-bit command or character data is sent in two steps: send the higher nibble first, and then the lower nibble. The R/W control pin is grounded, and therefore no data or status read from the LCD module is possible in this case.

The SH_CP (11) and ST_CP (12) clock inputs of 75HC595 are tied together, and will be driven by one microcontroller pin. Serial data from microcontroller is fed to the shift register through DS (14) pin. OE (13) pin is grounded and reset pin MR (10) is pulled high. Parallel outputs Q0-Q3 from 74HC595 are connected to D4-D7 pins of the LCD module. Similarly, Q4 output serves for RS control pin. If the LCD module comes with a built-in backlight LED, it can simply be turned ON or OFF through LED control pin shown above. Pulling the LED pin to logic high will turn the back light ON.

A first, a bit of data fed to DS pin of 74HC595 appears at Q0 output after 2 clocks (because SH_CP and ST_CP are tied). So, sending 4-bit data (D4-D7) and an RS signal require 6 clock pulses till they appear at Q0-Q4 outputs respectively. When the LCD module is turned ON, it is initialized in 8-bit mode. A number of initializing commands should be sent to operate the LCD module in 4-bit mode. All the driver routines that are discussed here are written in mikroC compiler. They work only for a 16×2 LCD module. User can modify the initialization operations inside the Initialize_LCD() routine to account for other LCD configurations. The driver routines and their functions are described below.

Write_LCD_Nibble() : Data or command byte is sent to the LCD module as two nibbles. So this function routine takes care for sending the nibble data to the LCD module.

At the beginning of your program, you need to define Data_Pin, Clk_Pin, and Enable_Pin to the chosen microcontroller ports. I am going to demonstrate here how to use these driver routines to display two blinking character strings, Message1 and Message2, at different locations. I am going to test our serial LCD module with PIC12F683 microcontroller. The test circuit is shown below.

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