1. 实验任务
利用8X8点阵显示数字0到9的数字。
2. 电路原理图
图4.25.1
3. 硬件系统连线
(1). 把“单片机系统”区域中的P1端口用8芯排芯连接到“点阵模块”区域中的“DR1-DR8”端口上;
(2). 把“单片机系统”区域中的P3端口用8芯排芯连接到“点阵模块”区域中的“DC1-DC8”端口上;
4. 程序设计内容
(1). 数字0-9点阵显示代码的形成
如下图所示,假设显示数字“0”
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00 00 3E 41 41 41 3E 00
因此,形成的列代码为 00H,00H,3EH,41H,41H,3EH,00H,00H;只要把这些代码分别送到相应的列线上面,即可实现“0”的数字显示。
送显示代码过程如下所示
送第一列线代码到P3端口,同时置第一行线为“0”,其它行线为“1”,延时2ms左右,送第二列线代码到P3端口,同时置第二行线为“0”,其它行线为“1”,延时2ms左右,如此下去,直到送完最后一列代码,又从头开始送。
数字“1”代码建立如下图所示1 2 3 4 5 6 7 8
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其显示代码为 00H,00H,00H,00H,21H,7FH,01H,00H
数字“2”代码建立如下图所示
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00H,00H,27H,45H,45H,45H,39H,00H
数字“3”代码建立如下图所示
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00H,00H,22H,49H,49H,49H,36H,00H
数字“4”代码建立如下图所示
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00H,00H,0CH,14H,24H,7FH,04H,00H
数字“5”代码建立如下图所示
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00H,00H,72H,51H,51H,51H,4EH,00H
数字“6”代码建立如下图所示
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00H,00H,3EH,49H,49H,49H,26H,00H
数字“7”代码建立如下图所示
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00H,00H,40H,40H,40H,4FH,70H,00H
数字“8”代码建立如下图所示
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00H,00H,36H,49H,49H,49H,36H,00H
数字“9”代码建立如下图所示
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00H,00H,32H,49H,49H,49H,3EH,00H
5. 汇编源程序
TIM EQU 30H
CNTA EQU 31H
CNTB EQU 32H
ORG 00H
LJMP START
ORG 0BH
LJMP T0X
ORG 30H
START: MOV TIM,#00H
MOV CNTA,#00H
MOV CNTB,#00H
MOV TMOD,#01H
MOV TH0,#(65536-4000)/256
MOV TL0,#(65536-4000) MOD 256
SETB TR0
SETB ET0
SETB EA
SJMP $