单片机原理及应用技术 苏家建 曹柏荣 汪志锋 课后习题参考答案

MOV30H,#0

蚂MOV31H,#0;i的初值

芇MOVR0,#30H

节

莇 MOVR2,#11 MOVA,31H LOOP:INC31H

芀ADDA,@R0 MOV@R0,A MOVA,31H RLA DJNZR2,LOOP

蒇SJMP$ END

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3-9已知片内RAM(30H)=38H,(38H)=40H,(40H)=48H,(48H)=90H.说明下列指令源操作数的寻址方式，及指令执行的结果 袇 MOVA,40H;A=48H直接寻址 薇 MOVR0,A；R0=48H寄存器寻址 薁 MOVP1,#0F0H;P1=0F0H直接寻址 羁 MOV@R0,30H;(48H)=38H寄存器间接寻址 蚆 MOVDPTR,#3848H;DPTR=3848H直接寻址 蚇 MOV40H,38H;(40H)=(38H)=40H直接寻址 羂 MOVR0,30H;R0=(30H)=38H寄存器寻址 葿 MOVP0,R0;P0=38H直接寻址 虿 MOV18H,#30H;(18H)=30H直接寻址

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螇MOVA,@R0;A=(38H)=40H直接寻址 MOVP2,P1;P2=0F0H直接寻址

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膁3-10设R0=32H,A=48H,片内RAM(32H)=80H,(40H)=08H.求指令运行的结果 MOVA,@R0;A=(32H)=80H

MOV@R0,40H;(32H)=（40H）=08H

螄MOV40H,A;(40H)=80H

蕿MOVR0,#35H;R0=35H 3-11设A=83H,R0=17H,片内RAM(17H)=34H,求指令运行的结果

羆ANLA,#17H;A=03H ORLA,17H;(17H)=（37H

莁XRLA,@R0;A=37H

羆CPLA;A=C8H 3-12编程实现片内RAM20H-2FH与30H-3FH中数据的对换 ORG0100H MOVR0,#20H MOVR1,#40H MOVR2,#0FH LOOP: MOVA,@R0 MOV@R1,A INCR0 INCR1 DJNZR2,LOOP MOVR0,#30H MOVR1,#20H

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芆 MOVR2,#0FH LOOP1:

MOVA,@R0

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蚀 MOV@R1,A INCR0 INCR1 DJNZR2,LOOP1

莂MOVR0,#30H MOVR1,#40H MOVR2,#0FH LOOP1: MOVA,@R1

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袀 MOV@R0,A INCR0 INCR1 DJNZR2,LOOP1 SJMP$ END 3-13 A=34H,(30H)=4FH,ADDA,30H执行后的结果 A=83H,PSW=41H 3-14SP=25H,PC=2345H,(24H)=12H,(25H)=34H,(26)=56H,执行RET后SP=?PC=? SP=23H,PC=3412H

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3-15SP=25H,PC=2345H,标号LABEL所在的地址3456H，执行LCALLLABEL后SP=?PC=?,堆栈中的数据有何变化？ 羁 SP=27H(26H)=48H(27H)=23HPC=3456H

蚅螂

第四章程序设计基础

4-1片内RAM30H单元开始存放着一组用补码表示的有符号数，数目存于20H单元。编程统计出正数，0，负数的数目，分别存到21H,22H,23H单元。 螅 ORG0100H 莂 MOV21H,#0 腿 MOV22H,#0 蒇 MOV23H,#0 袅 MOVR0,#30H

螃LOOP: MOVA,@R0 袁 CJNEA,#0,PD 葿 INC22H 羅 SJMPDONE

膃PD:JBACC.7,FU 荿 INC21H 芈 SJMPDONE

肅FU:INC23H

薄DONE: INCR0 肁 DJNZ20H,LOOP 肇 SJMP$ 膅 END

螁4-2片内RAM20H-2FH.凡是满足奇偶校验的数据（1的个数为偶数）的数转存到片外8000H开始的数据区 葿 ORG0100H 螆 MOVR0,#20H 膄 MOVDPTR,#8000H

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