2024年技能考试单片机原理及应用精选试题及答案.docx

2024年技能考试单片机原理及应用精选试题及答案

一、单选题(40题)

1.设在31H单元存有#23H,执行下面程序：MOVA,31HANLA,#OFHMOV41H,AMOVA,31HANLA,#OFOHSWAPAMOV42H,A则(41H)=(42H)=

A.(41H)=03H，(42H)=02H?

B.(41H)=03H，(42H)=03H?

C.(41H)=03H,(42H)=04H?

D.(41H)=03H，(42H)=05H?

2.当晶振频率为12MHz时，有效复位信号高电平常间要持续()

A.1μsB.2μsC.3μsD.4μs?

3.