1、基于51单片机的1632点阵显示设计基于51单片机的1632点阵显示设计LT2、单片机最小系统单片机最小系统,或者称为最小应用系统,是指用最少的元件组成的单片机可以工作的系统。对51系列单片机来说,最小系统一般应该包括:单片机、晶振电路、复位电路。3、列扫描驱动电路列扫描驱动电路是由反相器、译码器组成的5线32线译码器。译码器采用74HC154 4线16线译码器,74HC154译码器可接受4位高电平有效二进制地址输入,并提供16个互斥的低有效输出。反相器采用74HC04。电路图如下:4、行驱动电路由于单片机的数据/地址/控制总线端口都有一定的负载能力,如果负载超过其负载能力,一般应加驱动器。本
2、设计需要同时点亮多个LED,因此需要很大的电流输出,但51单片机的输出电流有限且不足以点亮多个LED,可能会导致LED亮度不足,所以用74HC245来放大电流。四、总体设计电路图五、程序设计以UCDOS中文宋体字库为例,每一个字由16行16列的点阵组成显示。即国标汉字库中的每一个字均由256点阵来表示。我们可以把每一个点理解为一个像素,而把每一个字的字形理解为一幅图像。事实上这个汉字屏不仅可以显示汉字,也可以显示在256像素范围内的任何图形。汉字可拆分为上部和下部,上部由816点阵组成,下部也由816点阵组成。利用字模提取软件得到汉字的代码,汉字的一列代码的上下两部分分别由P2、P3口输出,P
3、1口同时输出列扫描代码,使该列的LED亮。依照这个方法转向第2列、第3列,直至第16列的扫描,16列的LED快速连续地点亮,因为人眼的视觉暂留,LED显示屏会显示出一个汉字。六、硬件实物图七、心得体会通过本次的课程设计制作,我熟悉了仿真软件Protues和Keil的基本操作与功能,同时也学会了利用单片机动手制作出复杂的电子作品。在设计方案的时候,我遇到了不少麻烦,特别是设计硬件电路图这一部分,因为我要制作1632LED点阵,如果用书本上传统的方法会不够I/O口,因此我想出了列扫描采用5线32线译码器的方法。因为没有5线32线译码器的芯片,于是我在网上找到了利用74HCl54、74HC04连接成
4、5线32线译码器的方法。而在程序设计方面,因为我的设计运行的程序并不复杂,因此我很快就把程序编出来了,没有碰到什么难题。这次的课程设计大大增加了我对电子技术的兴趣和提高了我相关方面的技术。附:单片机程序 ORG 0000H START:MOV P2,#00H ;清除画面 MOV P3,#00H KEY1:MOV P0,#0FFH ;扫描开关 MOV A,P0 CPL A ANL A,#0FFH JZ KEY1 LCALL DELAY3 MOV A,P0 CPL A ANL A,#0FFH JZ KEY1 JB ACC.0,AMOD1 JB ACC.1,AMOD2 JB ACC.2,AMOD3
5、AMOD1:LJMP MOD1 ;转到子程序 AMOD2:LJMP MOD2 AMOD3:LJMP MOD3 MOD1:MOV P0,#0FFH ;静态显示 MOV A,P0 CPL A ANL A,#0FFH JZ L2 LCALL DELAY3 MOV A,P0 CPL A ANL A,#0FFH JZ L2 JB ACC.0,BMOD1 JB ACC.1,BMOD2 JB ACC.2,BMOD3 BMOD1:LJMP MOD1 BMOD2:LJMP MOD2 BMOD3:LJMP MOD3 L2:MOV R6,#32 MOV R4,#00H MOV R0,#00H L3:MOV DPTR
6、,#TABLE1 MOV A,R4 MOV P1,A INC R4 MOV A,R0 MOVC A,A+DPTR MOV P2,A INC R0 MOV A,R0 MOVC A,A+DPTR MOV P3,A INC R0 MOV R3,#128 DJNZ R3,$ ;延时 MOV P2,#00H ;清除画面 MOV P3,#00H DJNZ R6,L3 JMP MOD1 MOD2:MOV 20H,#00H ;滚屏显示 MOV R4,#00H M1:MOV R1,#3FH ;每幕停留时间 M2:MOV R6,#32 ;列扫描数 MOV R0,20H MOV P0,#0FFH MOV A,P0
7、CPL A ANL A,#0FFH JZ M3 LCALL DELAY3 MOV A,P0 CPL A ANL A,#0FFH JZ M3 JB ACC.0,CMOD1 JB ACC.1,CMOD2 JB ACC.2,CMOD3 CMOD1:LJMP MOD1 CMOD2:LJMP MOD2 CMOD3:LJMP MOD3 M3:CALL READ ;调用显示子程度 INC R4 DJNZ R6,M3 MOV R4,#00 DJNZ R1,M2 MOV A,20H ADD A,#04 ;移动列数*2 MOV 20H,A CJNE A,#192,M1 ;汉字数目*32 JMP MOD2 READ
8、:MOV A,R4 MOV P1,A MOV A,R0 MOV DPTR,#TABLE2 MOVC A,A+DPTR MOV P2,A INC R0 MOV A,R0 MOVC A,A+DPTR MOV P3,A INC R0 MOV R3,#128 DJNZ R3,$ ;延时 MOV P2,#00H MOV P3,#00H RET MOD3:MOV P0,#0FFH ;静态显示 MOV A,P0 CPL A ANL A,#0FFH JZ I2 LCALL DELAY3 MOV A,P0 CPL A ANL A,#0FFH JZ I2 JB ACC.0,DMOD1 JB ACC.1,DMOD2
9、 JB ACC.2,DMOD3 DMOD1:LJMP MOD1 DMOD2:LJMP MOD2 DMOD3:LJMP MOD3 I2:MOV R6,#32 MOV R4,#00H MOV R0,#00H I3:MOV DPTR,#TABLE3 MOV A,R4 MOV P1,A INC R4 MOV A,R0 MOVC A,A+DPTR MOV P2,A INC R0 MOV A,R0 MOVC A,A+DPTR MOV P3,A INC R0 MOV R3,#128 DJNZ R3,$ ;延时 MOV P2,#00H ;清除画面 MOV P3,#00H DJNZ R6,I3 JMP MOD3
10、DELAY3:MOV R7,#10H D31:MOV R6,#0FFH D32:DJNZ R6,D32 DJNZ R7,D31 RETTABLE1: ;至乐DB 00H,00H,00H,40H,02H,40H,42H,44H,62H,44H,52H,44H,4AH,44H,46H,44H,42H,7FH,42H,44H,42H,44H,52H,44H,62H,44H,0C2H,44H,02H,40H,00H,40HDB 00H,00H,0D8H,44H,0B4H,44H,93H,24H,0C8H,25H,00H,14H,0FCH,0DH,26H,05H,25H,0FFH,24H,05H,0FC
11、H,0DH,00H,14H,0D8H,24H,0B4H,24H,93H,44H,0C8H,45HTABLE2: ;欢迎光临DB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HDB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00
12、H,00H,00H,00H,00H,00HDB 00H,00H,04H,04H,74H,02H,5FH,0FFH,0F4H,55H,04H,55H,74H,7FH,0DFH,55H,74H,55H,24H,80H,18H,60H,0FH,1CH,0C8H,03H,08H,1CH,28H,60H,18H,80HDB 00H,00H,40H,00H,40H,40H,42H,20H,0CCH,1FH,00H,20H,00H,40H,0FCH,4FH,04H,44H,02H,42H,00H,40H,0FCH,7FH,04H,42H,04H,44H,0FCH,43H,00H,40HDB 00H,00H,
13、40H,80H,40H,80H,42H,40H,44H,20H,58H,18H,0C0H,07H,40H,00H,7FH,00H,40H,00H,0C0H,3FH,50H,40H,48H,40H,46H,40H,40H,40H,40H,78HDB 00H,00H,00H,00H,0FEH,7FH,22H,42H,22H,42H,3EH,7EH,22H,42H,0E2H,43H,10H,00H,08H,0FCH,0E7H,45H,24H,0FDH,24H,01H,24H,0FDH,0E4H,45H,04H,0FCHDB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00
14、H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HDB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HTABLE3: ;I love UDB 00H,00H,00H,00H,10H,40H,10H,40H,0F0H,7FH,10H,40H,10H,40H,00H,00HDB 00H,00H,0C0H,03H,0E0H,07H,0F0H,0FH,0F0H,1FH,0F0H,3FH,0E0H,7FH,0C0H,0FFH,0E0H,7FH,0F0H,3FH,0F0H,1FH,0F0H,0FH,0E0H,07H,0C0H,03H,00H,00H,00H,00HDB 10H,00H,0F0H,3FH,10H,40H,00H,40H,00H,40H,10H,40H,0F0H,3FH,10H,00H END
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