#include <reg51.h> void ex0_isr() interrupt 0 { static unsigned char led = 0x01; P2 = led; led = (led << 1) | (led >> 7); } void main() { IT0 = 1; EX0 = 1; EA = 1; P2 = 0x01; while(1); }
这段代码实现了基于51单片机的外部中断0(INT0)控制的LED流水灯效果。当INT0引脚检测到下降沿时，触发中断服务程序，使LED灯依次左移。 代码分析： 1. 中断服务程序ex0_isr()使用静态变量led保存当前LED状态 2. 每次中断触发时，LED状态左移1位，最高位循环到最低位 3. 主函数中配置了中断相关寄存器： - IT0=1 设置INT0为下降沿触发 - EX0=1 允许INT0中断 - EA=1 开启全局中断 4. P2端口初始化为0x01(最低位LED亮) 需要注意的三点： 1. 静态变量led在中断服务程序中使用，确保状态能保持 2. 循环移位操作(led << 1) | (led >> 7)实现了8位循环左移 3. while(1)空循环保持主程序运行，等待中断发生 [2025-06-22 23:19:09 | AI写代码神器 | 214点数解答]
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