LCDs

Character Display LCDs

Character display LCD ares used in so many products we used daily. We can find them in  Espresso machines, 3D printers, microwaves  and printers and many other products. In this lesson we going to lean how to interface LCD’s to our cortex- microcontroller board. This lessons covers just  character display LCD’s there is another lesson covering graphics display LCDs. Th most popular LCD controller currently on the market is the Hitachi HD44780, some other well-known ones include the Tinssharp/Eon 1602A. The content of this lesson applies to all LCD controllers. Where there is a little difference, it shall be indicated.

LCD Pinout 

LCD_pinout

LCD Pinout
Yellow text : Other names

Things to know 

  • LCD has two internal registers; instruction register and data register
  • RS pin is used for selecting these register-

              -RS = 0 : instruction command code select

              -RS = 1  : data command code select

              -RS  =0 allows us to send commands such as clear screen, move cursor etc.

              -RS= 1  allows us to send data to be displayed or retrieve displayed data .

  • R/W : Allows reading and writing information to LCD

              -R/W = 1 : reading

              -R/W = 0 : writing

  • E : E is known as the enable pin. It us used by the LCD to secure information.

             – When data is supplied to the data pins a High-Low pulse must be applied                  

               to the  E pin in order to secure the data. Minimum width of pulse should be                

                230ns for the Hitachi and 140ns for the Tinsharp.

  • D0-D7 :  These are known as the 8-bits data pins. They are used to transfer information to and from the LCDs.

 

LCD Control

LCD Control

LCD Pin Groupings 

Pin Groups

Pin Groups

Programming the LCD

Sending Commnd 
  1. Set RS =0 to select command register
  2. Send a High-Low pulse to E to secure command
Sending Data
  1. Set RS=1 to select data register
  2. Send a High-Low pulse to E to secure data
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