4-8.c

C51中断系统代码4,在Keil C51 7.0以上版本编译通过。

#include <reg51.h>
unsigned int interruptcnt;
		unsigned char second;
		void timer0 (void) interrupt 1 using 2 
		{
			if (++interruptcnt == 4000) 
			{ 	                            
				second++;                  
				interruptcnt = 0;           
			}
		}

void main()
{
}