1602液晶模块内部的字符发生存储器（CGROM)已经存储了不同的点阵字符图形，这些字符有，阿拉伯数字、英文字母的大小写、常用的符号、和日文假名等，每一个字符都有一个固定的代码，其中数字与字母同ASCII码兼容。-1602 LCD module within the character generation memory (cgrom) have been stored in different character dot matrix graphics, these characters, written in Arabic numerals, the letters of the alphabet size, commonly used symbols and Japanese kana and, every character have a fixed code, including letters and numbers with ASCII compatible.