additional serial port for 8051 microcontroller using keil software, this is polling based serial port by using timer 0 and external interrupt.

1、用单次脉冲申请中断，在中断处理程序中使P1.0的输出状态发生反转，并通过发光二极管观察P1.0的电平。 2、通过本实验加深对8051单片机中断系统的理解，学习外部中断的基本使用方法及相关编程。 -1 and disrupted by single pulse application in interrupt handlers make P1.0 output state reversals, and by observation of light emitting diode P1.

1、用单次脉冲申请中断，在中断处理程序中使P1.0的输出状态发生反转，并通过发光二极管观察P1.0的电平。 2、通过本实验加深对8051单片机中断系统的理解，学习外部中断的基本使用方法及相关编程。-1 and disrupted by single pulse application in interrupt handlers make P1.0 output state reversals, and by observation of light emitting diode P1.0