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单选题 MCS-51单片机在同一优先级的中断源,同时申请中断时,CPU首先响应()
学科：默认课程
时间：2025-12-02 13:07:02
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题目1单选题
8段共阳极LED显示字符"C"与8段共阴极LED显示数字"8",两个段码分别为()A. 0xC6、0x80B. 0x7F、0xC6C. 0xC6、0x7FD. 0x39、0x7F
题目2单选题
在AT89S51单片机的4个并行口中,需要外接上拉电阻的是()A. P2口B. P0口C. P3口D. P1口
题目3单选题
某一单片机应用系统需扩展10个功能键,通常采用()方式更好A. 独立键盘B. 动态键盘C. 矩阵键盘D. 静态键盘
题目4单选题
若单片机的振荡频率为12MHz,设定时器工作在方式1需要定时1ms,则定时器初值应为()A. 500B. 1000C. <img src="https://p.ananas.chaoxing.com/star3/origin/195ae16023fef9b721738ae64b6639bd.png">-500D. <img src="https://p.ananas.chaoxing.com/star3/origin/195ae16023fef9b721738ae64b6639bd.png">-1000
题目5单选题
MCS-51单片机在同一优先级的中断源,同时申请中断时,CPU首先响应()A. 外部中断1B. 外部中断0C. 定时器1中断D. 定时器0中断
题目6单选题
外中断初始化的内容不包括A. 设置外中断允许B. 设置中断响应方式C. 设置中断触发方式D. 设置中断总允许
题目7单选题
各中断源发出的中断请求信号,都会标记在MCS-51系统中的( )中A. TCON/SCONB. TMODC. IED. IP
题目8单选题
在LCD1602应用中下列哪一项不属于所使用到的函数模块A. 写命令函数B. 忙检测函数C. 中断触发函数D. 字符显示函数
题目9单选题
An auditor should consider two key issues when obtaining an understanding of a client's internal controls. These issues areA. the design and implementation of the controlsB. the frequency and effectiveness of the controlsC. the implementation and operating effectiveness of the controlsD. the effectiveness and efficiency of the controls
题目10单选题
Internal controlsA. consist of policies and procedures designed to provide reasonable assurance that the company achieves its objectives and goalsB. only apply to SEC companiesC. are implemented by and are the responsibility of the auditorsD. guarantee that the company complies with all laws and regulations
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