8031单片机共有多少个外部中断输入口？51单片机有几个中断源，分别是什么？

　　8031单片机共有多少个外部中断输入口？

　　有2个外部中断输入口，分别是外部中断0和外部中断1。

　　51单片机有几个中断源，分别是什么？

　　51单片机总共有5个中断源，分别为：

　　外部中断0（int0）,对应中断号是0,

　　中断入口地址0003h

　　定时/计数器0（t1）,对应中断号1

　　,中断入口地址000bh

　　外部中断1（int1）,中断号2

　　入口地址0013h

　　定时/计数器1（t1）中断号3

　　入口地址001bh

　　串行口中（ri/ti）中断号4

　　入口地址0023h

　　51单片机是对所有兼容Intel 8031指令系统的单片机的统称。该系列单片机的始祖是Intel的8004单片机，后来随着Flash rom技术的发展，8004单片机取得了长足的进展，成为应用最广泛的8位单片机之一，其代表型号是ATMEL公司的AT89系列，它广泛应用于工业测控系统之中。

　　很多公司都有51系列的兼容机型推出，今后很长的一段时间内将占有大量市场。51单片机是基础入门的一个单片机，还是应用最广泛的一种。需要注意的是51系列的单片机一般不具备自编程能力。

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　　共有5个中断源：（发生中断后，进入中断服务函数，执行玩中断服务函数后又硬件自动清零标志位）

　　外部中断0，interrupt 0 ,中断标志位IE0；

　　定时器0，interrupt 1,中断标志位TF0；

　　外部中断1，interrupt 2 ,中断标志位IE1；

　　定时器1，interrupt 3,中断标志位TF1；

　　串口中断，interrupt 4,中断标志位RI\TI；