lcd1602基于hd44780液晶芯片设计，该芯片集成了显示数据ram (ddram)、字符发生器rom (cgrom)以及用户自定义字符ram (cgram)。 这些组件共同 作用 ，实现了字符在 液晶屏 上的显示功能。

Jul 13, 2009 · DDRAM : 显示用ram,直接和屏幕上的点相对应.屏幕上的一个点和ddram中的一个位对应，字符屏的ddram和图形屏的ddram有一点点区别。 CGROM : 字模存储用空间。

Jan 28, 2019 · - ddram：数据显示ram，存储待显示的数据，ascii码存入后会自动转换为对应字符 - cgrom：字符产生器rom，包含预定义的字符形状 - cgram：字符图形ram，用户可以自定义字符 - ir和dr：命令寄存器和数据寄存器，rs引脚...

Following is the memory map for custom patterns in CGRAM. We can point the cursor to CGRAM address by sending command, which is 0x40 + CGRAM address (For more information please see Table 4 in commands section). Lets say we want to …

Nov 24, 2017 · CG RAM 1602能存储8个自定义字符，这8个自定义字符存储空间的首地址分别是：0X40，0X48，0X50，0X58，0X60，0X68，0X70，0X78。 以0x40来说，它的存储空间如图所示. 如果使用5*7字符的话，那么最左3位和最后一行的数据实际上是没用的，通常置0。 如果要自定义一个℃符号，那么先填框，如图（红1白0） 声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。 文章观点仅代表作者本人，不代表电子发烧友网立场。 文章及其配图仅供工 …

May 2, 2021 · CG-RAM is the main component in making custom characters. CG stands for custom generated and RAM you all know random access memory. This CG-RAM stores our custom characters once we declare them in our code.

Feb 12, 2021 · Custom characters are made in the CG-RAM of 16×2 character lcd and then invoked by controller for displaying on the 16×2 lcd. CG stands for “Character Generated” RAM (Read only memory). I used Hitachi 16×2 lcd in the project you can use any other.

Dec 30, 2012 · Set the CG RAM address by sending an instruction byte from 64 to 127 (locations 0-63 in CG RAM). Send bytes with the bit patterns for your symbol (s). The LCD controller automatically increments CG RAM addresses, in the same way as it …

Feb 7, 2025 · CG RAM (Character generator RAM) For making custom patterns we need to write values to the CGRAM area defining which pixel to glow. These values are to be written in the CGRAM adress starting from 0x40.

Feb 8, 2012 · Most of the alpha numeric LCD like 16x2 char or 16x4 char have ability to generate few custom characters. in this example i will show you how to make and display these custom characters on a 16x2 char lcd with Hitachi HD44780 lcd controller. HD44780 LCD can have upto 8 custom characters. the basic technology of lcd based on 3 type of memory.