The IR stores instruction codes, such as display clear and cursor shift, and address information for display data RAM (DDRAM) and character generator RAM (CGRAM). The HD44780U has two 8-bit registers, an instruction register (IR) and a data register (DR). Here, I’ll be considering the Hitachi HD44780 controller. As there is a specific function controller on the LCD itself controlling the display while reading in the user’s commands & data. Controlling all of this is a tedious task for our main microcontroller to do. The LCD module consists of 16×2 character cells, and each one of them is 5×8 dots. This is the pinout for a typical LCD 16×2 display unit. This small IC on the backside of the LCD module controls the LCD itself and accepts user commands and data sent by the master MCU. We’ll see how it works internally and how to interface it with microcontrollers. Assuming it has the standard Hitachi LCD driver HD44780 controller. Other types of LCDs provide different features such as the number of columns and rows (characters) and maybe colored display, and also different interfaces (parallel, spi, i2c, etc).įor this tutorial, we’ll consider the 16×2 LCD with a 16-pin header interface. You can use it to display text messages to the user, number, etc. We typically add a 16×2 Alphanumeric LCD to small embedded systems & projects to enhance the user experience and UI of the device/project. Component Name Buy On 1 PIC16F877AĪdd 1 BreadBoard Add 1 Alphanumeric LCD 16×2 Add 1 Jumper Wires Pack Add Add 1 LM7805 Voltage Regulator (5v) Add 1 8MHz Crystal Oscillator Add 1 PICkit2 or 3 Programmer Add Required Components For This Tutorial Qty.
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