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<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> JZ MATCH1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> XRL A,N2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> JNZ NOMATCH</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ADD A,#15H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MATCH1:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ADD A,#7</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R4,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> NOMATCH:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R5,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDM</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0000 7423 MOV A,#23H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0002 CHK #65H,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0002 6465 XRL A,#65H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0004 6005 JZ MATCH10001</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0006 6B XRL A,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0007 7005 JNZ NOMATCH0001</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0009 2415 ADD A,#15H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+ MATCH10001:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+000B 2407 ADD A,#7</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+000D FC MOV R4,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+ NOMATCH0001:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+000E FD MOV R5,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 000F E6 MOV A,@R0</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0010 CHK R2,#23H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0010 6A XRL A,R2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0011 6006 JZ MATCH10002</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0013 6423 XRL A,#23H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0015 7005 JNZ NOMATCH0002</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0017 2415 ADD A,#15H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+ MATCH10002:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0019 2407 ADD A,#7</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+001B FC MOV R4,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+ NOMATCH0002:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+001C FD MOV R5,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 001D 00 NOP</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0000 END</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">The Cybernetic Micro Systems 8051 Family Assembler, Version
3.03 Page 2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 08-27-96</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ;%T Symbol Name Type Value</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CHK . . . . . . . . . . . . . . M 0000</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MATCH10001. . . . . . . . . . . L 000B</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MATCH10002. . . . . . . . . . . L 0019</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> NOMATCH0001 . . . . . . . . . . L 000E</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> NOMATCH0002 . . . . . . . . . . L 001C</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ;%Z</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 00 Errors (0000)</p>
</font></i>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>从列表文件中我们可以看到，汇编程序已对宏指令中的标号作了处理，在第一次引用时，宏指令中的标号ＭＡＴＣＨ１及ＮＯＭＡＴＣＨ分别衩扩展为ＭＡＴＣＨ１００１及ＮＯＭＡＴＣＨ０００１，而第二次被引用时相应的标号被扩展为ＭＡＴＣＨ１００２及ＮＯＭＡＴＣＨ０００２，从而避免在同一程序中标号的重复。</font></p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>“＆”在宏指令中作为连接操作符。“＆”通常出现在带有形参的字符串中。为了区分字符串中哪些字符是形参，需要在形参与固定字符间加入“＆”例如：</font></p>
<font face="Arial" size=3>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> <i> CON MACRO X1,X2,SI,L1</i></p>
<i>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R2,#X1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R2,#X1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ADD A,#X1+5-X2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> DB 'STRING&SI&'</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> JNZ LAB&L1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> LAB&L1:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> XRL A,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDM</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CLR A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON 23H,65H,SPECIAL,57</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> END</p>
</i></font>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>列表文件如下：</font></p>
<i><font face="Arial" size=3>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">The Cybernetic Micro Systems 8051 Family Assembler, Version
3.03 Page 1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 08-27-96</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON MACRO X1,X2,SI,L1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R2,#X1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R2,#X1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ADD A,#X1+5-X2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> DB 'STRING&SI&'</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> JNZ LAB&L1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> LAB&L1:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> XRL A,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDM</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0000 E4 CLR A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0001 CON 23H,65H,SPECIAL,57</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0001 7A23 MOV R2,#23H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0003 7A23 MOV R2,#23H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0005 24C3 ADD A,#23H+5-65H</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0007 53 54 52 DB 'STRINGSPECIAL'</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+000A 49 4E 47 53 50 45 43 49 41 4C</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0014 7000 JNZ LAB57</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+ LAB57:</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">+0016 6B XRL A,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 0000 END</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">The Cybernetic Micro Systems 8051 Family Assembler, Version
3.03 Page 2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 08-27-96</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ;%T Symbol Name Type Value</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON . . . . . . . . . . . . . . M 0000</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> LAB57 . . . . . . . . . . . . . L 0016</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ;%Z</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 00 Errors (0000)</p>
</font></i>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>在算术表达式中所有的加数否需要连接操作符，这是因为算术操作符本身具有符号与数之间的自然分隔符作用。立即操作数（由＃符号引导）可以用一个空格把它与一个形参分开，在这种情况下也不需要字符“＆”。</font></p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>最后，所有的宏指令所支持的功能可以合并起来使用，从而组成一个相当复杂的宏指令，例如宏指令可以包括条件结构，或者宏指令可以是一个条件结构的一部分，但是宏指令不可以嵌套，条件结构不可以超过宏指令的边界。即宏指令必须完全在一个条件结构中，或者条件结构必须在一条宏指令中。可以通过形参来决定条件表达式的值。当宏指令衩调用时，传递的实际参数值将决定每一条指令的生成代码。如：</font></p>
<i><font face="Arial" size=3>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON MACRO C1,C2,P1,P2,P3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV A,P1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> IF C1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> INC R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R4,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDIF</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> IF C2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R5,P2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ADDC A,P3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ELSE</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R1,P2</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> XRL A,R3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDIF</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV @R1,A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ENDM</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CLR A</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV R3,#2AH</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON 0,0,#23H,#65H,R6</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> END</p>
</font></i>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font face="宋体" lang="ZH-CN" size=3>列表文件如下：</font></p>
<i><font face="Arial" size=3>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">The Cybernetic Micro Systems 8051 Family Assembler, Version
3.03 Page 1</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> 08-27-96</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> CON MACRO C1,C2,P1,P2,P3</p>
<p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> MOV A,P1</p>
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