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

膂 MOVR2,#0FH LOOP: MOVA,@R0 JBPSW.0,DONE MOVX@DPTR,A INCDPTR DONE:INCR0 DJNZR2,LOOP

莄SJMP$

羄END 4-3编程，把外部RAM1000H-10FFH的数据传送到2000H开始的区域 ORG0100H MOVR3,#10H MOVR4,#20H MOVDPL,#00H MOVR2,#0 LOOP:MOVDPH,R3 MOVXA,@DPTR MOVDPH,R4 MOVX@DPTR,A INCDPL DJNZR2,LOOP SJMP$ END

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4-4片内RAM30H单元开始存放着一组无符号数，其数目在21H单元中。编程将其中最小的数存入21H 芃 ORG0100H 螀 MOVR0,#30H 蚆 MOVR2,21H 螄 MOVA,30H

蚄LOOP: CJNEA,@R0,PD 蒂 SJMPDONE

蝿PD:JNCDONE 袃 MOV22H,@R0 袁 XCHA,22H

羀DONE:INCR0 蒈 DJNZR2,LOOP 羃 MOV21H,A 节 SJMP$ 蚂 END

芇4-5编程实现片内RAM30H单元开始的16个数按顺序颠倒过来 莇 ORG0100H 蚃 MOVR0,#30H 肀 MOVR1,#40H 芀 MOVR2,#0FH

蒇LOOP:MOVA,@R0 肄 MOV@R1,A 螂 INCR0

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聿 INCR1 DJNZR2,LOOP MOVR2,#0FH MOVR0,#40H MOVR1,#3FH LOOP1:

MOVA,@R0

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薁 MOV@R1,A INCR0 DECR1 DJNZR2,LOOP1 SJMP$ END 4-6编程实现片内RAM30H单元开始的16个数，存有最小数值的所在单元的内容改为0FFH

螇ORG0100H MOVR0,#30H MOVR2,#16 MOVA,30H MOV22H,#0;22H存放找到的16个数中的最小值 MOV23H,#0;存放最小数值的地址放到23H LOOP: CJNEA,@R0,PD SJMPDONE PD:JNCDONE MOV22H,@R0 MOV23H,R0

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羆 XCHA,22H DONE:INCR0 DJNZR2,LOOP MOVR0,23H MOV@R0,#0FFH SJMP$ END 4-7编程实现P1.7=P1.6(P1.5?P1.4) ORG0100H MOVC,P1.5 ANLC,/P1.4 MOV20H,C MOVC,P1.4 ANLC,/P1.5 ORLC,20H ANLC,P1.6 MOVP1.7,C END

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4-8编程统计片内RAM30H单元开始的16个数，有多少数大于40，小于80，将结果存入40H单元中 莂 ORG0100H 莈 MOVR0,#30H 蒆 MOVR2,#16 肂 MOV40H,#0

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