建立用户的LCD字符显示Application
Note AN211
Creating Custom LCD Characters
Introduction
This application note describes the method of creating custom characters on LCD and VFD dis-
plays that use the Hitachi HD44780 or a compatible controller. The code described here builds on
display functions from ICOM.LIB, the Intellicom driver library.
Custom LCD Characters
In addition to the actual display RAM, the widely-used Hitachi HD44780 LCD controller contains
enough “character generation” RAM (CGRAM) for eight 5x8 characters. When ASCII values 0-7
are sent to the LCD, the actual character image is taken from the CGRAM instead of the fixed
character ROM.
Character Definition
The characters are defined as eight bytes, one for each hori……
