基于单片机+MAX7219驱动点阵程序_诺佳网——最实用的IT互联网信息网站

MAX7219数据手册

（从官方英文手册翻译过来）

一、概述

MAX7219/MAX7221是一种集成化的串行输入/输出共阴极显示驱动器,它连接微处理器与8位数字的7段数字LED显示，也可以连接条线图显示器或者64个独立的LED。其上包括一个片上的B型BCD编码器、多路扫描回路，段字驱动器，而且还有一个8*8的静态RAM用来存储每一个数据。只有一个外部寄存器用来设置各个LED的段电流。MAX7221与SPI™、QSPI™以及 MICROWIRE™相兼容，同时它有限制回转电流的段驱动来减少EMI（电磁干扰）。一个方便的四线串行接口可以联接所有通用的微处理器。每个数据可以寻址在更新时不需要改写所有的显示。MAX7219/MAX7221同样允许用户对每一个数据选择编码或者不编码。整个设备包含一个150μA的低功耗关闭模式，模拟和数字亮度控制，一个扫描限制寄存器允许用户显示1-8位数据，还有一个让所有LED发光的检测模式。在应用时要求3V的操作电压或segment blinking，可以查阅MAX6951数据资料。

二、应用

条线图显示仪表面板工业控制 LED矩阵显示

三、管脚配置

四、功能特点

10MHz 连续串行口
独立的LED 段控制
数字的译码与非译码选择
150μA 的低功耗关闭模式
亮度的数字和模拟控制
高电压中断显示
共阴极LED 显示驱动
限制回转电流的段驱动来减少EMI（MAX7221）
SPI, QSPI, MICROWIRE串行接口（MAX7221）
24 脚的DIP 和SO 封装

五、分类信息

芯片工作温度范围管脚封装

MAX7219CNG 0°C to +70°C 24 Narrow Plastic DIP

MAX7219CWG 0°C to +70°C 24 Wide SO

MAX7219C/D 0°C to +70°C Dice*

MAX7219ENG -40°C to +85°C 24 Narrow Plastic DIP

MAX7219EWG -40°C to +85°C 24 Wide SO

MAX7219ERG -40°C to +85°C 24 Narrow CERDIP

五、典型应用电路

六、功能图表

七、时序图

MAX7219原理图

MAX7219驱动程序

#include < reg51.h >
#include < intrins.h >


#define uchar unsigned char
#define uint  unsigned int


//定义Max7219端口
sbit Max7219_pinCLK = P2^2;
sbit Max7219_pinCS  = P2^1;
sbit Max7219_pinDIN = P2^0;
uchar code disp1[38][8]={
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
{0x10,0x18,0x14,0x10,0x10,0x10,0x10,0x10},//1
{0x7E,0x2,0x2,0x7E,0x40,0x40,0x40,0x7E},//2
{0x3E,0x2,0x2,0x3E,0x2,0x2,0x3E,0x0},//3
{0x8,0x18,0x28,0x48,0xFE,0x8,0x8,0x8},//4
{0x3C,0x20,0x20,0x3C,0x4,0x4,0x3C,0x0},//5
{0x3C,0x20,0x20,0x3C,0x24,0x24,0x3C,0x0},//6
{0x3E,0x22,0x4,0x8,0x8,0x8,0x8,0x8},//7
{0x0,0x3E,0x22,0x22,0x3E,0x22,0x22,0x3E},//8
{0x3E,0x22,0x22,0x3E,0x2,0x2,0x2,0x3E},//9
{0x8,0x14,0x22,0x3E,0x22,0x22,0x22,0x22},//A
{0x3C,0x22,0x22,0x3E,0x22,0x22,0x3C,0x0},//B
{0x3C,0x40,0x40,0x40,0x40,0x40,0x3C,0x0},//C
{0x7C,0x42,0x42,0x42,0x42,0x42,0x7C,0x0},//D
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x7C},//E
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x40},//F
{0x3C,0x40,0x40,0x40,0x40,0x44,0x44,0x3C},//G
{0x44,0x44,0x44,0x7C,0x44,0x44,0x44,0x44},//H
{0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x7C},//I
{0x3C,0x8,0x8,0x8,0x8,0x8,0x48,0x30},//J
{0x0,0x24,0x28,0x30,0x20,0x30,0x28,0x24},//K
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x7C},//L
{0x81,0xC3,0xA5,0x99,0x81,0x81,0x81,0x81},//M
{0x0,0x42,0x62,0x52,0x4A,0x46,0x42,0x0},//N
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//O
{0x3C,0x22,0x22,0x22,0x3C,0x20,0x20,0x20},//P
{0x1C,0x22,0x22,0x22,0x22,0x26,0x22,0x1D},//Q
{0x3C,0x22,0x22,0x22,0x3C,0x24,0x22,0x21},//R
{0x0,0x1E,0x20,0x20,0x3E,0x2,0x2,0x3C},//S
{0x0,0x3E,0x8,0x8,0x8,0x8,0x8,0x8},//T
{0x42,0x42,0x42,0x42,0x42,0x42,0x22,0x1C},//U
{0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18},//V
{0x0,0x49,0x49,0x49,0x49,0x2A,0x1C,0x0},//W
{0x0,0x41,0x22,0x14,0x8,0x14,0x22,0x41},//X
{0x41,0x22,0x14,0x8,0x8,0x8,0x8,0x8},//Y
{0x0,0x7F,0x2,0x4,0x8,0x10,0x20,0x7F},//Z
{0x8,0x7F,0x49,0x49,0x7F,0x8,0x8,0x8},//中
{0xFE,0xBA,0x92,0xBA,0x92,0x9A,0xBA,0xFE},//国
};
void Delay_xms(uint x)
{
 uint i,j;
 for(i=0;i< x;i++)
  for(j=0;j< 112;j++);
}
//--------------------------------------------
//功能：向MAX7219(U3)写入字节
//入口参数：DATA 
//出口参数：无
//说明：
void Write_Max7219_byte(uchar DATA)         
{
      uchar i;    
    Max7219_pinCS=0;    
      for(i=8;i >=1;i--)
          {      
            Max7219_pinCLK=0;
            Max7219_pinDIN=DATA&0x80;
            DATA=DATA< < 1;
            Max7219_pinCLK=1;
           }                                 
}
//-------------------------------------------
//功能：向MAX7219写入数据
//入口参数：address、dat
//出口参数：无
//说明：
void Write_Max7219(uchar address,uchar dat)
{ 
     Max7219_pinCS=0;
   Write_Max7219_byte(address);           //写入地址，即数码管编号
     Write_Max7219_byte(dat);               //写入数据，即数码管显示数字 
   Max7219_pinCS=1;                        
}


void Init_MAX7219(void)
{
 Write_Max7219(0x09, 0x00);       //译码方式：BCD码
 Write_Max7219(0x0a, 0x03);       //亮度 
 Write_Max7219(0x0b, 0x07);       //扫描界限；8个数码管显示
 Write_Max7219(0x0c, 0x01);       //掉电模式：0，普通模式：1
 Write_Max7219(0x0f, 0x00);       //显示测试：1；测试结束，正常显示：0
}
void main(void)
{
 uchar i,j;
 Delay_xms(50);
 Init_MAX7219();  
 while(1)
 {
  for(j=0;j< 38;j++)
  {
   for(i=1;i< 9;i++)
    Write_Max7219(i,disp1[j][i-1]);
   Delay_xms(1000);
  }  
 } 
}

基于单片机+MAX7219驱动点阵程序

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