main.c

自制方波发生器及频率计 材料: AT89S52 + AT89C2051 1个8位共阳七段显示器 8个NPN三极管 11.0592Mhz晶振x2

#include <reg51.h>

sbit P1_0 = P1^0;

#define HIGH_BIT 0xFD
#define LOW_BIT 0xC0

void Timer0() interrupt 1
{
	unsigned char i = 5;
	TH0 = HIGH_BIT;
	TL0 = LOW_BIT + 4 + 2;
	
	P1_0 = 0;
	while (i--); // 10 cycles  = 10.85 ns
	P1_0 = 1;
}

void main()
{
	TMOD = 0x01;
	// 11.0592 Mhz  10 ms
	TH0 = HIGH_BIT;
	TL0 = LOW_BIT;
	
	EA=1;
	ET0=1;
	TR0=1;

	for (;;) ;
}