stc mcu c语言延时老是出问题

我用了一款STC12C系列 QFP 在用T0中断做延时时设置1T和12T频率一样搞了好久没搞定不知道怎么回事？

下面程序out=46.8KHZ fosc=4M （这个很难理解46.8KHZ怎么来的）

#unsigned char b;

void Init_Timer0(void)

{

TMOD |= 0x01;

//TH0=0x00;

//TL0=0x00;

EA=1;

ET0=1;

TR0=1;

}

void main (void)

{

Init_Timer0();

if(b=1)

OUT=~OUT;

b=0;

while(1)

{

}

void Timer0_isr(void) interrupt 1 using 1

{

static unsigned char i;

TH0=(65536-1)/256;

TL0=(65536-1)%256;

i++；

b=1;

{

i=0;

}

全部回复(4)

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yueyunno1

2014-10-30 11:30

void main (void)
{
    Init_Timer0();
    if(b=1)
    OUT=~OUT;
    b=0;
    while(1)
    {
    }

看看你的这段代码，while(1)前面的，

if(b=1)
 OUT=~OUT;
 b=0;
放在whlie(1)x循环里面试试

yueyunno1

2014-10-30 11:34

@yueyunno1

voidmain(void){Init_Timer0();if(b=1)OUT=~OUT;b=0;while(1){}}看看你的这段代码，while(1)前面的，if(b=1)OUT=~OUT;b=0;放在whlie(1)x循环里面试试

下面这是官方的资料，好好参考一下

#include "reg51.h"

typedef unsigned char BYTE;
typedef unsigned int WORD;

//-----------------------------------------------

/* define constants */
#define FOSC 18432000L
#define MODE1T                      //Timer clock mode, comment this line is 12T mode, uncomment is 1T mode

#ifdef MODE1T
#define T1MS (65536-FOSC/1000)      //1ms timer calculation method in 1T mode
#else
#define T1MS (65536-FOSC/12/1000)   //1ms timer calculation method in 12T mode
#endif

/* define SFR */
sfr AUXR = 0x8e;                    //Auxiliary register
sbit TEST_LED = P0^0;               //work LED, flash once per second

/* define variables */
WORD count;                         //1000 times counter

//-----------------------------------------------

/* Timer0 interrupt routine */
void tm0_isr() interrupt 1 using 1
{
    TL0 = T1MS;                     //reload timer0 low byte
    TH0 = T1MS >> 8;                //reload timer0 high byte
    if (count-- == 0)               //1ms * 1000 -> 1s
    {
        count = 1000;               //reset counter
        TEST_LED = ! TEST_LED;      //work LED flash
    }
}

//-----------------------------------------------

/* main program */
void main()
{
#ifdef MODE1T
    AUXR = 0x80;                    //timer0 work in 1T mode
#endif
    TMOD = 0x01;                    //set timer0 as mode1 (16-bit)
    TL0 = T1MS;                     //initial timer0 low byte
    TH0 = T1MS >> 8;                //initial timer0 high byte
    TR0 = 1;                        //timer0 start running
    ET0 = 1;                        //enable timer0 interrupt
    EA = 1;                         //open global interrupt switch
    count = 0;                      //initial counter

    while (1);                      //loop
}

jerrywong

LV.2

2014-10-31 13:07

@yueyunno1

下面这是官方的资料，好好参考一下#include"reg51.h"typedefunsignedcharBYTE;typedefunsignedintWORD;//-----------------------------------------------/*defineconstants*/#defineFOSC18432000L#defineMODE1T//Timerclockmode,commentthislineis12Tmode,uncommentis1Tmode#ifdefMODE1T#defineT1MS(65536-FOSC/1000)//1mstimercalculationmethodin1Tmode#else#defineT1MS(65536-FOSC/12/1000)//1mstimercalculationmethodin12Tmode#endif/*defineSFR*/sfrAUXR=0x8e;//AuxiliaryregistersbitTEST_LED=P0^0;//workLED,flashoncepersecond/*definevariables*/WORDcount;//1000timescounter//-----------------------------------------------/*Timer0interruptroutine*/voidtm0_isr()interrupt1using1{TL0=T1MS;//reloadtimer0lowbyteTH0=T1MS>>8;//reloadtimer0highbyteif(count--==0)//1ms*1000->1s{count=1000;//resetcounterTEST_LED=!TEST_LED;//workLEDflash}}//-----------------------------------------------/*mainprogram*/voidmain(){#ifdefMODE1TAUXR=0x80;//timer0workin1Tmode#endifTMOD=0x01;//settimer0asmode1(16-bit)TL0=T1MS;//initialtimer0lowbyteTH0=T1MS>>8;//initialtimer0highbyteTR0=1;//timer0startrunningET0=1;//enabletimer0interruptEA=1;//openglobalinterruptswitchcount=0;//initialcounterwhile(1);//loop}

#define T1MS (65536-FOSC/1000)
#else
#define T1MS (65536-FOSC/12/1000)

改成

#define T1MS (65536-FOSC/1)

#else
#define T1MS (65536-FOSC/12/1)

理论上应该是1us 但实际相差很多，而且很不稳定。

jerrywong

LV.2

2014-11-05 14:19

@jerrywong

#defineT1MS(65536-FOSC/1000) #else#defineT1MS(65536-FOSC/12/1000)改成#defineT1MS(65536-FOSC/1) #else#defineT1MS(65536-FOSC/12/1)理论上应该是1us但实际相差很多，而且很不稳定。

没解决得了，最后还是用软件延时解决了

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stc mcu c语言 延时老是出问题

stc mcu c语言延时老是出问题