当 8255 端口 PA ． PB 分别工作在方式 2 ．方式 1 时，其 PC 端口可用作（）。 -题库考试答案搜索网

当 8255 端口 PA ． PB 分别工作在方式 2 ．方式 1 时，其 PC 端口可用作（）。

单选题

2021-09-01 23:48

A、一个8位I／O
B、两个4位I／O
C、全部联络线
D、输入端口

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正确答案

C

试题解析

标签：青书学堂大连工业大学微机接口技术

感兴趣题目

当并行接口芯片8255A被设定为方式2时，其工作的I/O口

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

●设AND、OR和NOT分别表示按位与、按位或和按位求反运算，且X=10011011，Y=01111010，Z=11101000，则(NOT(X) AND Y)= (9) ， (Y OR NOT(Z))= (10) 。10011011011110101110100001100000(10)

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

有接口电路图如下，看图后回答问题。（1）．写出跳线接/Y0和/Y1位置时，8255的地址范围（2）．设有8个按键的状态需要通过8255A的PA口输入到微机中，画出按键S0、S1，，，S7 与PA0、PAl，，，PA7顺序连接。要求；按键按下时。输入状态为0 （3）．编写有关指令序列，对8255进行初始化、查询有无按键按下，若有，则将读人状态存人数据段

相关题目: boost的意思是:help or encourage to increase or improve; eloquent的意思是:fluent or persuasive in speaking or writing; A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.; 当 8255 端口 PA ． PB 分别工作在方式 2 ．方式 1 时，其 PC 端口可用作（）。; Mainly east 3 or 4 partly cloudy to overcast occasional rain（）slowly south moderate or good.; （）any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local quarantine officer must be notified immediately．; Should any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local Quarantine Officer must be（）immediately.; Masters are（）solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.; 系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。; The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire，（）the claimant proves that the fire arose from fault or neglect on the part of the carrier，his servants or agents.; Shutdown price（or point，or rule）停业价格（或停业点、停业原则）; 翻译：With Average or With Particular Average（WA or WPA）（）; 8255A的端口A工作在方式2时，端口B只能工作在方式0下。; 接口电路8255的特点是（）。
①可编程的并行接口电路；
②可编程的串行接口电路；
③有4个端口、32根I/O线；
④有三种工作方式；
⑤每个8255接口电路需4个地址；
⑥工作方式0时无条件传送数据。; （）shall be liable for loss of and damage to the Vessel and／or goods arising or resulting from inaccuracies in stating the description，quantity，weight，measurement or contents.; 8255有多种工作方式，A端口有（）种工作方式，B端口有（）种工作方式，C端口有（）种工作方式。; 可编程并行接口芯片8255A中有多少个输入/输出端口？; 可编程并行通信接口8255A的端口C可以设置成; 可编程并行通信接口8255A的置位/复位控制字可以对端口; I/O接口电路中，8255控制口可能使用的端口地址只能是（）。

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