Question

求解单片机问题，请问这种题怎么判断呀，关于中断信号的

当IP=1CH, IE=9FH时, 若5个中断源同时提出中断申请, 此时CPU应响应的中断源是（　B　）。
A.外中断0　　 　B.外中断1　　　　　　C.定时器T0　　　　　　　D.定时器T1

Answer 1

这是我30多年前学习的课程，人生苦短！

表一：只有 C/T2（ET2） 不允许中断。

表二：外部中断0 优先级最高。

表三：中断源查询顺序。

正确答案是 A 。

Answer 2

中断源提出中断请求，由中断控制允许控制决定是否响应中断，如果允许响应中断，则CPU按设定好的优先级的顺序响应中断。如果是同一优先级的中断，则按单片机内部的自然优先级顺序（外部中断0→定时器0中断→外部中断l→定时器1中断→串行接口中断）响应中断。
你的判断题一个是外边中断0

追问

意思是答案错了 不应该选外中断1 应该选外中断0吗

追答

是的

Answer 3

这个现在真不会了，数字逻辑学早忘光了…

Answer 4

China is like a soft persimmon, which the West holds at will. What is the motive behind it? No matter whether a person steals it or not, if someone names and names, they will be avoided by those who don't know the truth, and they will be regarded as street mice. The mouse pointed at the rabbit and said to the cat and dog, Look, what is the mouse doing? The cat can't catch the rabbit without the mouse. But the dog is different. The dog will take the mouse to be nosy, and will see the rabbit can't spread its legs, grin its teeth and salivate.