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51汇编语言程序设计.pdf

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1、第四章 MCS-51汇编语言程序设计重点及难点：单片机汇编语言程序设计的基本概念、伪指令、单片机汇编语言程序的三种基本结构形式、常用汇编语言程序设计。教学基本要求：1、掌握汇编语言程序设计的基本概念；2、掌握伪指令的格式、功能和使用方法；3、掌握顺序结构、分支结构和循环结构程序设计的步骤和方法；4、掌握常用汇编语言程序设计步骤和方法。教学内容4.1汇编语言程序设计概述一、汇编语言的特点（1）助记符指令和机器指令一一对应，所以用汇编语言编写的程序效率高，占用存储空间小，运行速度快，因此汇编语言能编写出最优化的程序。（2）使用汇编语言编程比使用高级语言困难，因为汇编语言是面向计算机的，汇编语言的程

2、序设计人员必须对计算机硬件有相当深入的了解。（3）汇编语言能直接访问存储器及接口电路，也能处理中断，因此汇编语言程序能够直接管理和控制硬件设备。（4）汇编语言缺乏通用性，程序不易移植，各种计算机都有自己的汇编语言，不同计算机的汇编语言之间不能通用；但是掌握了一种计算机系统的汇编语言后，学习其他的汇编语言就不太困难了。二、汇编语言的语句格式：；三、汇编语言程序设计的步骤与特点（1）建立数学模型（2）确定算法（3）制定程序流程图（4）确定数据结构（5）写出源程序（6）上机调试程序4.2伪指令伪指令是程序员发给汇编程序的命令，也称为汇编命令或汇编程序控制指令。MCS-51 常见汇编语言程序中常用

3、的伪指令：第四章MCS-51 汇编语言程序设计91 1ORG（ORiGin）汇编起始地址命令 ORG 2END（END of assembly）汇编终止命令 END 3EQU（EQUate）赋值命令 EQU 4DB（Define Byte）定义字节命令 DB 5DW（Define Word）定义数据字命令 DW 6DS（Define Stonage）定义存储区命令 DW 7BIT 位定义命令 BIT 8DATA 数据地址赋值命令 DATA 4.3单片机汇编语言程序的基本结构形式一、顺序程序例 4-1 三字节无符号数相加，其中被加数在内部RAM 的 50H、51H 和 52H 单元中；加数在内部

4、RAM 的 53H、5414和 55H 单元中；要求把相加之和存放在50H、51H 和 52H 单元中，进位存放在位寻址区的00H 位中。MOV R0，#52H；被加数的低字节地址MOV R1，#55H；加数的低字节地址MOV A，R0 ADD A，R1；低字节相加MOV R0，A；存低字节相加结果DEC R0 DEC R1 MOV A，R0 ADDC A，R1；中间字节带进位相加MOV R0，A；存中间字节相加结果DEC R0 DEC R1 MOV A，R0 ADDC A，R1；高字节带进位相加MOV R0，A；存高字节相加结果CLR A 文档编码:CT8M8K8R1E3 HI6N10X5T

5、4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2

6、F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K

7、8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X

8、5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6

9、T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M

10、8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N1

11、0X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2ADDC A，#00H；存放进位的单元地址MOV R0，A；进位送 00H 位保存二、分支程序1单分支程序例 4-2 变量 X 存放在 VAR 单元内，函数值Y 存放在 FUNC 单元中，试按下式的要求给 Y 赋值。010001XXXY本题的程序流程见图4-1（a）。参考程序：ORG 1000H VAR DATA

12、30H FUNC DATA 31H MOV A，VAR；A XJZ DONE；若 X=0，则转 DONE JNB ACC.7，POSI；若 X0，则转 POSI MOV A，#0FFH；若 X0，则 Y=1 DONE：MOVE FUNC，A；存函数值SJMP$END 图 4-1 例 4-2的分支流程图文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T

13、4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2

14、F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K

15、8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X

16、5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6

17、T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M

18、8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N1

19、0X5T4M5 ZA6S4H6T2F2第四章MCS-51 汇编语言程序设计93 这个程序的特征是先比较判断，然后按比较结果赋值，这实际是三分支而归一的流程图，因此，至少要用两个转移指令。初学者很容易犯的一个错误是：漏掉了其中的SJMP DONE语句，因为流程图中没有明显的转移痕迹。这个程序也可以按图4-1（b）的流程图来编写，其特征是先赋值，后比较判断，然后修改赋值并结束。参考程序：ORG 1000H VAR DATA 30H FUNC DATA 31H MOV A，VAR；A X JZ DONE；若 X=0，则转 DONE MOV R0，#0FFH；先设 X0，R0=FFH JNB ACC.

20、7，NEG；若 X0，R0=1 NEG：MOV A，#01H；若 X0，则 Y=1 DONE：MOV FUNC，A；存函数值SJMP$END 2多分支程序图 4-2 多分支程序转移三、循环程序循环程序一般由4 部分组成:（1）置循环初值，即确立循环开始时的状态。（2）循环体（工作部分），要求重复执行的部分。（3）循环修改，循环程序必须在一定条件下结束，否则就要变成死循环。（4）循环控制部分，根据循环结束条件，判断是否结束循环。以上 4 个部分可以有两种组织方式。例 4-3 从 BLOCK 单元开始存放一组无符号数，一般称为一个数据块。数据块长度放在 LEN 单元，编写一个求和程序，将和存入SU

21、M 单元，假设和不超过8 位二进制数。在置初值时，将数据块长度置入一个工作寄存器，将数据块首地址送入另一个工作寄存器，一般称它为数据块地址指针。每做一次加法之后，修改地址指针，以便取出下一个数来相加，并且使计数器减1。到计数器减到0 时，求和结束，把和存入SUM 即可。文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文

22、档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1

23、E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4

24、M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F

25、2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8

26、R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5

27、T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T

28、2F2参考程序：各单元的地址是任意的。LEN DATA 20H SUM DATA 21H BLOCK DATA 22H CLR A；清累加器MOV R2，LEN；数据块长度送R2 MOV R1，#BLOCK；数据块首址送Rl LOOP：ADD A，R1；循环做加法INC R1；修改地址指针DJNZ R2，LOOP；修改计数器并判断MOV SUM，A；存和以上程序在计数器初值不为零时是没有问题的，但若是数据块的长度有可能为零，则将出现问题。当R2 初值为零，减1 之后将为 FFH，故要做 256 次加法之后才会停止，显然和题意不符。若考虑到这种情况，则可按图4-3（b）的方式来编写程序。在做加法

29、之前，先判断一次 R2 的初值是否为零。整个程序仍基本套用原来的形式：CLR A；清累加器MOV R2，LEN；数据块长度送R2 MOV R1，#BLOCK；数据块首址送Rl INC R2 SJMP CHECK LOOP：ADD A，R1；循环做加法INC R1；修改地址指针CHECK：DJNZ R2，LOOP MOV SUM，A；存和4.4MCS-51 单片机汇编语言程序设计举例一、算术运算程序例 4-4 假定 R2、R3 和 R4、R5 分别存放两个16 位的带符号二进制数，其中R2 和 R4 的最高位为两数的符号位。请编写带符号双字节二进制数的加减法运算程序，以BSUB 为减法程序入口，

30、以BADD 为加法程序入口，以R6、R7保存运算结果。参考程序：BSUB：MOV A，R4；取减数高字节CPL ACC.7；减数符号取反以进行加法MOV R4，A BADD：MOV A，R；取被加数MOV C，ACC.7 MOV F0，C；被加数符号保存在F0 中XRL A，R4；两数高字节异或文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5

31、 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文

32、档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1

33、E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4

34、M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F

35、2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8

36、R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5

37、T4M5 ZA6S4H6T2F2第四章MCS-51 汇编语言程序设计95 MOV C，ACC.7；两数同号 CY=0，两数异号 CY=1 MOV A，R2 CLR ACC.7；高字节符号位清“0”MOV R2，A；取其数值部分MOV A，R4 CLR ACC.7；低字节符号位清“0”MO V R4，A；取其数值部分JC JIAN；两数异号转 JIAN JIA：MOV A，R3；两数同号进行加法ADD A，R5；低字节相加MOV R7，A；保存和MOV A，R2 ADDC A，R4；高字节相加MOV R6，A；保存和JB ACC.7，QAZ；符号位为“1”转溢出处理QWE：MOV C，F0；结果

38、符号处理MOV ACC.7，C MOV R6，A RET JIAN：MOV A，R3；两数异号进行减法CLR C SUBB A，R5；低字节相减MOV R7，A；保存差MOV A，R2 SUBB A，R4；高字节相减MOV R6，A；保存差JNB ACC.7，QWE；判断差的符号，为“0”转 QWE BMP：MOV A，R7；为“1”进行低字节取补CPL A ADD A，#1 MOV R7，A MOV A，R6；高字节取补CPL A ADDC A，#0 MOV R6，A CPL F0；保存在 F0 中的符号取反SJMP QWE；转结果符号处理QAZ：；溢出处理文档编码:CT8M8K8R1E3

39、HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5

40、ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档

41、编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E

42、3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M

43、5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2

44、文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R

45、1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2二、数制转换程序例 4-5 在内部 RAM 的 hex 单元中存有 2 位十六进制数，试将其转换为ASCII 码，并存放于 asc和 asc+1两个单元中。主程序（MAIN）：MOV SP，#3FH MAIN：PUSH hex；十六进制数进栈ACALL HASC；调用转换子程序POP asc；第一

46、位转换结果送asc单元MOV A，hex；再取原十六进制数SWAP A；高低半字节交换PUSH ACC；交换后的十六进制数进栈ACALL HASC POP asc+l；第二位转换结果送asc+l单元子程序（HASC）：HASC：DEC SP；跨过断点保护内容DEC SP POP ACC；弹出转换数据ANL A，#0FH；屏蔽高位ADD A，#7；修改变址寄存器内容MOVC A，A+PC；查表PUSH ACC；查表结果进栈INC SP；修改堆栈指针回到断点保护内容INC SP RET SP ASCTAB：DB“0，1，2，3，4，5，6，7”；ASCII 码表DB“8，9，A，B，C，D，E，F

47、”三、定时程序有多个定时需要，我们可以先设计一个基本的延时程序，使其延迟时间为各定时时间的最大公约数，然后就以此基本程序作为子程序，通过调用的方法实现所需要的不同定时。例如要求的定时时间分别为5s、l0s 和 20s 并设计一个1s延时子程序DELAY，则不同定时的调用情况表示如下：MOV R0，#05H；5s延时LOOP1：LCALL DELAY DJNZ R0，LOOP1 MOV R0，#0AH；10s 延时LOOP2：LCALL DELAY 文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6

48、S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:

49、CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 H

50、I6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 ZA6S4H6T2F2文档编码:CT8M8K8R1E3 HI6N10X5T4M5 Z

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