timer.c

51单片机的AD程序

#include <REGX51.H>
#include "type.h"
#include "config.h"

void timer0(void) interrupt 1 using 2
{
  EA = 0;
  //TF = 0;       //已经有硬件清0
  P3_4 = ~P3_4; //P3_4引脚电平反转，产生500KMHz频率方波，
                //P3_4接到ADC0809的CLOCK脚，作为时钟驱动ADC0809
  TH0 = 0x1F;
  TL0 = 0xFE;
  EA = 1;
}