delay.c

这是我在单片机c8051f020下写的SST 29LE020这款flash的驱动程序

#include "c8051f020.h"
#include "delay.h"
UINT16 TIME;
void delay(UINT16 time)
{
  TIME = time;
  CKCON &= ~(0x08); //定时器0用系统时钟的12分频 
  TMOD |= 0x01;  //定时器0用方式1：16位定时器
  TL0 = 0xdc;   //定时num = 1ms TL0 = - num
  TH0 = 0xf7;   // TH0 = (-num) >> 8;
  EA = 1; //允许总中断
  ET0 = 1;  //允许定时器0中断
  TR0 = 1; //定时器启动
  while(TIME); //等待定时器中断
  TR0 = 0; //关定时器
  ET0 = 0;//关定时器中断
  EA = 0; //关总中断
}

void TIMER0_Init() interrupt 1
{
  TL0 = 0xdc; //重载初值
  TH0 = 0xf7;
  TIME--; //定时次数减1
}

/*
void delay1ms(INT16 time)
{
  INT16 base = 2500;
  while(--time)
  {
      while(--base);
	  base = 2500;
  }
}
*/