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1、http:/ 星期一, 九月 28, 2020LCD12864原理与应用 1、LCD12864简介： LCD12864分为两种，带字库的和不带字库的，不带字库的液晶显示汉字的时候可以选择自己喜欢的字体。而带字库的液晶，只能显示GB2312字体，当然也可以显示其他的字体，不过是用图片的形式显示。 下面介绍不带字库的LCD12864,以Proteus中的AMPIRE12864为例，如下图所示，它的液晶驱动器为KS0108。引脚功能：引脚符号状态引脚名称功能CS1，CS2输入芯片片选端，都是低电平有效CS1=0开左屏幕，CS1=1关左屏幕CS2=0开右屏幕，CS2=1关右屏幕RS输入数据/命令选择信
2、号RS=1为数据操作，RS=0为写指令或读状态RW输入读写选择信号R/W=1为读选通，R/W=0为写选通E输入读写使能信号在E下降沿，数据被锁存(写)入液晶，在E高电平期间，数据被读出 DB0DB7三态数据总线数据或指令的传送通道RST输入复位信号，低电平时复位复位时，关闭液晶显示，使显示起始行为0，可以跟单片机的复位引脚RST相连，也可以直接接VCC，使之不起作用V0液晶显示器驱动电压-Vout-10VLCD驱动负电压 与带字库的液晶不同，此块液晶含有两个液晶驱动器，每块驱动器都控制64*64个点，分为左右两个屏幕显示，总共为128*64个点（即有12864个点）。这就是为什么AMPIRE1
3、28*64有CS1和CS2两个片选端的原因。此液晶有8页，一页有8行点阵点，左右各64列，共128列。如下图所示：2、LCD12864中的几条重要指令（一）行(line)设置命令:由此可见显示的起始行地址为0XC0，共64行，有规律地改变起始行号，可以实现滚屏效果。（二）页(page)设置指令:起始页地址为0XB8，因为液晶有64行点，分为8页，每页就有8行点。（三）列(column)地址设置指令每块驱动器的列地址都是从0X40到0X7F，共64列，所以此液晶共有128列点。（四）读状态指令3、用LCD12864显示汉字（一） 由于这块液晶不带字库，我们就要自己编写字库，编写字库所用的字模提取
4、软件为Zimo21(软件下载地址http:/ uchar unsigned char#define uint unsigned int/下面是“欢迎访问伊人憔悴百度空间”点阵数据，一个汉字有32字节数据组成unsigned char code huan= / 欢0x04,0x24,0x44,0x84,0x64,0x9C,0x40,0x30,0x0F,0xC8,0x08,0x08,0x28,0x18,0x00,0x00,0x10,0x08,0x06,0x01,0x82,0x4C,0x20,0x18,0x06,0x01,0x06,0x18,0x20,0x40,0x80,0x00;unsigned
5、char code ying= /迎0x40,0x40,0x42,0xCC,0x00,0x00,0xFC,0x04,0x02,0x00,0xFC,0x04,0x04,0xFC,0x00,0x00,0x00,0x40,0x20,0x1F,0x20,0x40,0x4F,0x44,0x42,0x40,0x7F,0x42,0x44,0x43,0x40,0x00;unsigned char code fang= /访0x40,0x40,0x42,0xCC,0x00,0x08,0x08,0xF8,0x89,0x8E,0x88,0x88,0x88,0x08,0x08,0x00,0x00,0x00,0x00,
6、0x3F,0x90,0x48,0x30,0x0F,0x00,0x40,0x80,0x40,0x3F,0x00,0x00,0x00;unsigned char code wen= /问0x00,0xF8,0x01,0x02,0x00,0xE2,0x22,0x22,0x22,0xE2,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x1F,0x08,0x08,0x08,0x1F,0x00,0x40,0x80,0x7F,0x00,0x00;unsigned char code yi= /伊0x00,0x80,0x60,0xF8,0x07
7、,0x20,0x22,0x22,0xFE,0x22,0x22,0x22,0xFE,0x20,0x20,0x00,0x01,0x00,0x00,0xFF,0x00,0x80,0x42,0x32,0x0F,0x02,0x02,0x02,0x07,0x00,0x00,0x00;unsigned char code ren= /人0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x3F,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x40,0x20,0x10,0x0C,0x03,0x00,0x00,0x00,0x03,0x0C,0x1
8、0,0x20,0x40,0x80,0x00;unsigned char code qiao= /憔0xE0,0x00,0xFF,0x10,0x20,0x10,0xFC,0x27,0x24,0x25,0xFE,0x24,0x24,0x24,0x04,0x00,0x01,0x00,0xFF,0x00,0x80,0x60,0x1F,0x29,0xC9,0x09,0x2F,0xC9,0x09,0x29,0xC8,0x00;unsigned char code cui= /悴0x80,0x70,0x00,0xFF,0x08,0x90,0x44,0x34,0x45,0x86,0x44,0x34,0x44,
9、0x84,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x04,0x04,0x04,0x04,0xFE,0x04,0x04,0x04,0x04,0x04,0x00;unsigned char code bai= /百0x02,0x02,0xE2,0x22,0x22,0x32,0x2A,0x26,0x22,0x22,0x22,0x22,0xE2,0x02,0x02,0x00,0x00,0x00,0xFF,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0xFF,0x00,0x00,0x00;unsigned char code
10、du= /度0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00,0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00;unsigned char code kong= /空0x10,0x0C,0x44,0x24,0x14,0x04,0x05,0x06,0x04,0x04,0x14,0x24,0x44,0x14,0x0C,0x00,0x00,0x40,0x40,0x41,0x41,0x
11、41,0x41,0x7F,0x41,0x41,0x41,0x41,0x40,0x40,0x00,0x00;unsigned char code jian= /间0x00,0xF8,0x01,0x06,0x00,0xF0,0x12,0x12,0x12,0xF2,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x1F,0x11,0x11,0x11,0x1F,0x00,0x40,0x80,0x7F,0x00,0x00;sbit CS1=P20;/片选1,低电平有效，CS1=0开左屏幕，CS1=1关左屏幕sbit CS2=P21;/片选2
12、，低电平有效，CS2=0开右屏幕，CS2=1关右屏幕sbit RS=P22;/数据，指令选择信号，RS=1为数据操作，RS=0为写指令或读状态（一般为读忙标志）sbit RW=P23;/读写选择信号，RW=1为读选通，RW=0为写选通sbit EN=P24;/读写使能信号void busy()/忙检测函数P0=0X00; /这句不能少RS=0; RW=1;EN=1;while(P0&0X80);/P0&0X80结果为真则一直执行空操作，也就是说P0&0X80为0则结束循环EN=0;void wcmd(uchar cmd)busy(); /每次写入指令或数据之前都进行忙检测RS=0;RW=0;P
13、0=cmd;EN=1;_nop_();_nop_();/在EN下降沿写入数据和指令EN=0;void wdata(uchar dat) /写命令和写数据只在RS=0或RS=1上不同，其余都相同busy();RS=1;RW=0;P0=dat;EN=1;_nop_();_nop_();/在EN下降沿写入数据和指令EN=0;void set_page(uchar page)/设置页，12864LCD共有8页，每页有8行点阵点。page=0xb8|page; /首页地址为0XB8wcmd(page); /page取值范围为07,表示第1到8页void set_line(uchar line)/设置显示的起始行，共有063行，一般从0行开始显示line=0xc0|line; /起始行地址0XC0wcmd(line);/line取值范围为063，表示第1到64行void set_column(uchar column)/设置显示的列/column=column&0x3f; /列的最大值为0X3F，即64column=0x40|column; /列的首地址为0X40,wcmd(column); /column的取值范围为063，共64列void set_onoff(uchar onoff)/设置显示开关，onoff取值为0或1onoff|=0x3e;
