8051單片機使用定時器0產生1ms嘀嗒代碼

#include <reg51.h>
#include <intrins.h>

UINT32 system_tick;
UINT16 led_tick;

//延時程序，需要根據不同的晶振大小調整

//////////////// 定時器T0

//11.0592M (50ms 4C00, 5ms EE00, 1ms FC66, 0.5ms FE33, 0.2ms FF47, 0.1ms FFA3, 0.05ms FFD1, 0.01ms FFF6)

//22.1184M (50ms xxxx, 5ms DC00, 1ms F8CD, 0.5ms FC66, 0.2ms FE8F, 0.1ms FF48, 0.05ms FFA4, 0.01ms FFEE)

#define T0_TH0 0xF8
#define T0_TL0 0xCD

void timer0_init(){
    TMOD &= 0xf0;    //定時器0,工作方式1

    TMOD |= 0x01;
    TH0 = T0_TH0;
    TL0 = T0_TL0;
    ET0=1; //開定時中斷允許

    TR0 = 1;//啓動定時器0

    EA=1; //開總中斷
    system_tick = 0;
    led_tick = 0;
}

sbit led=P1^2;
sbit led_0 = P1^0;
sbit led_1 = P1^1;


//每tick 1ms
void timer0_interrupt(void) interrupt 1
{
    TH0 = T0_TH0;    //必須重新賦值才能讓定時器循環工作

    TL0 = T0_TL0;
    ++system_tick;

if((UINT16)system_tick-led_tick > 1000){
        led_tick = system_tick;
        led_1 = !led_1;
    }
}

//1個tick爲 1ms
void Delayms(UINT16 ms){
    UINT16 ct16;
    ct16 = (UINT16)system_tick;
    while((UINT16)system_tick-ct16 < ms);
}