基于74hc595和74hc138的点阵显示

1、基于74hc595和74hc138的点阵显示基于74hc595和74hc138的16x40点阵显示作者：廖基鑫 桂林电子科技大学 一、电路原理图(1)输入输出口JP1为输入口，JP2为输出口(为串联下一块点阵)，245为电平转换(2)行控制端电路有2块3-8译码器组成4-16译码器。将A,B,C,D,接入一个8位I/O 口，直接 对I/O 口赋值行写入端电路、74HC595介绍。74HC595是一款漏极开路输出的CMO够位寄存器，输出端口为可控的三态输 出端，亦能串行输出控制下一级级联芯片。10脚SCLR移位寄存器清零端 直接接地，11脚SCK数据输入时钟线12脚RCK输出存储器锁存时钟线13

2、脚OE输出使能 低电平为输出有效14脚SI数据线 串行输入数据，亦 能串行输出数据到下一级级联芯片11i in Wats & 儿 $5m qh二恵銅库i腑6GSO5册103riff伸T禺11QHftHl11hCK11OE14S3Eric 预vcc输入数据程序：1.向595写一个字节的数据void write_595(uchar DATA)/ 向 595 写一个字节的数据 uchar i;for(i=0;i1;苗wfi厂1y50SCLE RC*OEXX幕HQA -QH Oi *11 .i；RlXXX： X：LQA QH ifisilfi - iffl XLXLh6 /j lHHXAT r J-.

3、 n Z hX卜少HXXj Hid询和嘲砥鸟謀卅iX*歸IMmiH 山，盼|为軾曰CiK1 hJlii，祁皿俩關状自和门2.向多个595写一个字节的数据9脚SQH位串行数据输出管脚 将多个595的数据由9脚传至下一个595,全部写入后在打开输出存储器锁存时钟线for(i=0;i0;j-) /向多个 595 写一个字节的数据 write_595(display7k); write_595(display7k-1); write_595(display6k); write_595(display6k-1); write_595(display5k); write_595(display5k-1);

4、 write_595(display4k); write_595(display4k-1); k+=2;hang=16-j; / 为 138 输入行控制数据RCK=1;RCK=0;delay_ms(20);3(595-RCK信号与138的输出使能E2信号为同一信号，故可以相连。UK斶ct占n器心 4U2ABC6BB3CC4ABCVCCL41EN5FD 6三、74hc138介绍。3线,8线译码器当一个选通端(G1)为高电平，另两个选通端(/(G2A)和/(G2B)为低电平时，将 地址端(A、B、C)的二进制编码在一个对应的输出端以低电平译出。利用G1、/(G2A)和/(G2B)可级联扩展成24线

5、译码器;若外接一个反相器还可 级联扩展成32线译码器nmcurrnr1b. 1It111T1U1(IILW2003仙71I-6Ty-54Qi1sb1r jt7IUlT7J愉岀 M 20-13U9 GNDCGM -CJ- L-卅4 Lw L tJI.M -11U3 -1门-1101 -I毗1! IE TnEl 附录：原理图源程序：/16x64点阵程序及滚动效果视频#in clude#defi ne uchar un sig ned char#defi ne uint un sig ned int#define hang P1 /行扫描接在 P1 口sbit SI=P2A3;sbit SCK=P2

6、A0；sbit OE=P2A2;sbit RCK=P2A1；uint coun ter;uchar flag;void delay_ms(uchar z) / 延时 0.5 秒uchar i,j;for(i=z;i0;i-)for(j=120;j0;j-);uchar code display32=/*-文字 : 好 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x10,0x00,0x11,0xFC,0x10,0x08,0x10,0x10,0xFC,0x20,0x24,0x20,0x24,0x2 0,0x27,0xFE,0x44,0x20,0x64,0x20,0x18

7、,0x20,0x08,0x20,0x14,0x20,0x26,0x20,0x44,0xA0,0x80,0x40, /*- 文字： 好 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x10,0x00,0x11,0xFC,0x10,0x08,0x10,0x10,0xFC,0x20,0x24,0x20,0x24,0x2 0,0x27,0xFE,0x44,0x20,0x64,0x20,0x18,0x20,0x08,0x20,0x14,0x20,0x26,0x20,0x44,0xA0,0x80,0x40, /*-文字 ： 学 -*/*- 宋体12;此字体下对应的点阵为：宽x高=

8、16x16 -*/0x01,0x08,0x10,0x8C,0x0C,0xC8,0x08,0x90,0x7F,0xFE,0x40,0x04,0x8F,0xE 8,0x00,0x40,0x00,0x80,0x7F,0xFE,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x02,0x80,0x01,0x00, /*- 文字 ： 习 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x00,0x00,0x3F,0xFC,0x00,0x04,0x08,0x04,0x04,0x04,0x03,0x04,0x01,0x14,0x00,0x64,0x0

9、1,0x84,0x06,0x04,0x38,0x04,0x10,0x04,0x00,0x04,0x00,0x24,0x00,0x14,0x00,0x00, /*- 文字 : 天 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x00,0x08,0x7F,0xFC,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x04,0xFF,0xF E,0x01,0x00,0x02,0x80,0x02,0x80,0x04,0x40,0x04,0x40,0x08,0x20,0x10,0x10,0x20,0x0E,0xC0,0x04,/*-文字： 天 -*/*-

10、宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x00,0x08,0x7F,0xFC,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x04,0xFF,0xFE,0x 01,0x00,0x02,0x80,0x02,0x80,0x04,0x40,0x04,0x40,0x08,0x20,0x10,0x10,0x20,0x0E,0xC0,0x04,/*-文字： 向 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x02,0x00,0x04,0x00,0x08,0x04,0x7F,0xFE,0x40,0x04,0x40,0x24,0x4F,0

11、xF4,0x 48,0x24,0x48,0x24,0x48,0x24,0x48,0x24,0x4F,0xE4,0x48,0x24,0x40,0x04,0x40,0x14,0x40,0x08,/*-文字： 上 -*/*- 宋体12;此字体下对应的点阵为：宽x高=16x16 -*/0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x10,0x01,0xF8,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x04,0xFF,0xFE,0x00,0x00;v

12、oid write_595(uchar DATA) / 向 595 写一个字节的数据uchar i;for(i=0;i1;void main() / 主函数uchar i,j,k;OE=0; /154 使能EA=1; / 开总中断TMOD=0x01; /定时器 0 工作方式 0ET0=1; / 定时器 0 使能TH0=(65535-50000)/256; / 定时器 0 设置初值TL0=(65536-50000)%256;while(1)for(i=0;i0;j-) /向多个 595 写一个字节的数据write_595(display7k);write_595(display7k-1);wri

13、te_595(display6k);write_595(display6k-1);write_595(display5k);write_595(display5k-1);write_595(display4k);write_595(display4k-1);k+=2;hang=16-j;RCK=1;RCK=0;delay_ms(20);TR0=1;flag=1;while(flag) / 停留一秒uchar j;for(j=0;j0;i-) /字滚动出显示区k=31;for(j=i-1;j0;j-)write_595(display7k);write_595(display7k-1);writ

14、e_595(display6k);write_595(display6k-1);write_595(display5k);write_595(display5k-1);write_595(display4k);write_595(display4k-1);k-=2;hang=j;RCK=1;RCK=0;delay_ms(20);for(i=0;i0;j-) write_595(display3k); write_595(display3k-1); write_595(display2k);write_595(display2k-1); write_595(display1k);write_595(display1k-1); write_595(display0k);write_595(display0k-1);k+=2;hang=16-j;RCK=1;RCK=0;delay_ms(20);TR0=1;flag=1;while(flag) /停留一秒uchar j;for(j=0;j0;i-) /滚出显示区k=31;for(j=i-1;j0;j-)write_595(display3k);write_595(display3k-1);write_595(display2k);write_595(display2k-1);write_595(dis