内部RAM的24H单元中存有压缩的BCD码,编制程序将其转换为非压缩的BCD码,并将转换结果存放到30H单元和31H单元中。要求:30H单元存放十位,31H单元存放个位。 -题库考试答案搜索网

内部RAM的24H单元中存有压缩的BCD码,编制程序将其转换为非压缩的BCD码,并将转换结果存放到30H单元和31H单元中。要求:30H单元存放十位,31H单元存放个位。

问答题

2022-04-02 17:32

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正确答案

ORG 0100H

MOV A, 24H ; (A)←(24H)，缩BCD码送入累加器A中

MOV 31H, #00H ; (31H)←00H，清31H单元

MOV R0, #31H ; (R0)←31H

XCHD A, @R0 ; 24H单元内容的低4位与31H单元内

; 容的低4位交换

SWAP A ; 24H单元内容的高4位与低4位交换

MOV 30H, A ; 送转换结果的十位到30H单元中

SJMP $ 程序执行完，“原地踏步”

END

试题解析

标签：佳木斯职业学院继续教育学院物联网应用技术高起专单片机原理及应用（面授）平时作业1

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