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What is CGRAM and DDRAM in LCD?
DDRAM stands for Display Data RAM. The Display Data RAM holds the letters that get shown on the LCD of a character LCD module. The value in the DDRAM is used to find the correct bitmap in the CGROM (Character Generator ROM) or CGRAM (Character Generator RAM), it is this small bitmap that gets displayed on the LCD.
What is the usage of CGROM Memory of the LCD display?
CGROM stands for Character Generator ROM. The CGROM stores the font that is displayed on a character LCD. When you tell a character LCD to display the letter ‘A’, it needs to know which dots to turn on so that we see an ‘A’. This information is stored in the CGROM.
What is DDRAM in LCD?
DDRAM registers in which position which character in the ASCII chart would be displayed. Each byte of DDRAM represents each unique position on the LCD display. The LCD controller reads the information from the DDRAM and displays it on the LCD screen. CGRAM allows user to define their custom characters.
Whats a CGRAM?
CGRAM – stands for “Character Graphics Random Access Memory” allows the user to define special supplementary non-standard character types that are not in the CGROM. You can load your own dot pattern shapes e.g. a rectangle into CGRAM and using certain reserved codes in DDRAM, call these up for display.
What are the different modes of LCD display one can use?
The categories of the different LCD display types are:
- Monochrome (single color) Static. Graphic. Character. Custom.
- Multi-Color. TFT. FSC (Field Sequential Color LCD ) EBT (Excellent Black Technology) aka VA (Vertical alignment) CSTN.
Is there any memory in LCD?
LCD Memory: LCD display contains three memory blocks: 1. DDRAM Display Data RAM; 2. CGRAM Character Generator RAM; and 3.
What do you mean by addressing of LCD?
The LCD controller takes the first code that it receives, stores it at the specified address, and simultaneously displays the corresponding character on the display.