单片机实验讲义.pdf
《单片机实验讲义.pdf》由会员分享,可在线阅读,更多相关《单片机实验讲义.pdf(18页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、单片机实验讲义2013 年 10 月 27 日星期日实验一汇编指令的练习与BCD 码加减运算一实验要求学习和掌握 keil汇编编译系统,编写通用4 字节压缩BCD 码的加、减法运算程序。二实验目的通过学习多字节压缩BCD 码加减运算的程序设计;学习汇编程序的编写,学会编译.asm源程序,编译,下载。学习断点设置,单步执行,SFR特殊功能寄存器的查看等编程基本功能。三 实验原理对于简单的8 位加减可以直接调用指令就可以了。例如加法可以使用指令ADD 以及带进位加ADDC,但单字节加减法只能在256 之内进行运算;在实际应用中经常需要进行多字节运算,从而处理更大的数据。该实验介绍单片机BCD 码多
2、字节加、减运算通用程序的设计。1多字节无符号压缩BCD 码加法运算假设多字节无符号被加数的最低字节的地址为R0,加数的最低字节地址为R1,字节数共为 len;计算结果的地址于被加数相同。入口参数:R0:被加数地址指针;R1:加数地址指针;len:字节数。出口参数:R0:计算结果;rLen:计算结果字节数。使用资源:ACC,R0、R1,内部 RAM 单元 len、rlen 及存放被加数、加数、计算结果的内存单元。示例程序如下:len DATA 70H rlen DATA 71H ADDSTART:PUSH PSW;保护标志寄存器内容CLR C;进位位清0 MOV rlen,#00H;和的字节数先
3、清0 LOOP:MOV A,R0;取被加数ADDC A,R1;求和DA A;十进制调整MOV R0,A;保存INC R0;地址增1 文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1
4、U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6
5、S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1
6、U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6
7、S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1
8、U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6
9、S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8INC R1 INC rlen;字节数增1 DJNZ len,LOOP;所有字节未加完继续,否则向下执行JNC ADDEND;和的最高字节无进位转ADD20 MOV R0,#01H;和的最高字节地址内容为01H INC rlen
10、 ADDEND:POP PSW RET END 多字节加法运算一般是按从低字节到高字节的顺序进行的,所以必须考虑低字节向高字节的进位情况,被加数和加数的压缩BCD 码,最大不超过99,而 99+99+1(进位)=199,此时可以不需要使用ADDC 指令,但当最低两字节相加后,必须使用“DA A”进行十进制调整,调整后产生进位。而最高两字节相加后应考虑是否有进位。若有进位,应向和的最高位字节地址写入01H,这时和数将比加数或被加数多出一个字节。2多字节无符号压缩BCD 码减法运算为了使用“DA A”指令对十进制减法进行调整,必须采用对减数求补相加的方法,以9AH 为模减去减数即得到减数的补数。设
11、被减数低字节地址在R1 中,减数低字节地址在R0 中,字节数在len 中;差的低字节地址在R0 中,差的字节数在rlen 中。入口参数:R0:减数地址指针;R1:被减数地址指针;len:字节数出口参数:R0:差的地址指针rlen:差的字节数使用资源:A,R0,R1,内部 RAM 单元范例程序如下:范例程序如下:SUBSTART:MOV rlen,#00H;差字节单元清0 CLR 07H;07H 做符号位标准,符号位清0 CLR C;借位位清0 SUB1:MOV A,#9AH;减数对模100 求补SUBB A,R0 ADD A,R1;补码相加DA A MOV R0,A;存结果INC R0 INC
12、 R1 1NC rlen CPL C;进位求反以形成正确借位DJNZ len,SUBl;未减完继续,减完向下执行JNC SUB2;无借位去别m 返回主程序,否则继续SETB 07H;有借位,置“1”符号位文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4
13、M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 H
14、G5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4
15、M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 H
16、G5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4
17、M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 H
18、G5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8SUB2:RET END 程序中对减数求补后与被减数相加,用“DA A”指令进行调整。若二者相加调整后结果无进位(C=0),则表示二者相减有借位;若二者相加
19、调整后有进位(C;1),则表示二者相减无借位。所以必须对进位标志位C 进行求反操作,才能得到正确结果。文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z
20、5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3
21、ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z
22、5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3
23、ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z
24、5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3
25、ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8文档编码:CS8Z5U3Y6S1 HG5N5R6X2S3 ZI5J1U6J4M8实验二串并转换实验(串口实验)一.实验要求利 用 8031 串 行 口,和 并 行 输 出 串 行 移 位 寄 存 器 74LS164,扩 展 一 位 数 码 显 示 在数 码 显 示 器 上 循 环 显 示 0-9 这 10 个 数 字。二.实验目的1.掌
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 单片机 实验 讲义
限制150内