C language uses the timer method to control the LED light to flash at a speed of 1S-EEWORLD

Collect

Recently, because I can't catch up with the progress of the advanced class, the tutorials given by the teacher are always intermittent, so I plan to study with the netizens who passed the exam on November 1st. Haha, this is also a lesson for me. In 3D learning, you must persist in taking one step at a time. Persistence will surely bring miracles, but you must keep up with everyone. No matter how busy you are in the future, you must work hard to realize your plan. You can't be like this time, because of the so-called exam, you missed several classes, but it doesn't matter. It's always good to learn some lessons. I can give myself some time to learn more basic knowledge.

Today I started to learn the counter of the microcontroller. Haha, it may be because I always couldn't set the timer accurately when programming in C language. When I learned that I could make the microcontroller C language timer accurate after learning the timer/counter, I felt really motivated to learn it. Although it took me a long time to write a simple program, it felt so refreshing. I think the key to learning the timer/counter is to learn how to program and control TCOM, TMOD, TH and TL. The main thing is the accurate calculation of TH and TL. And how to use it with the loop statement after the completion of the time.

The program I wrote today uses the microcontroller timer to control the LED light to flash at a speed of 1S. My crystal oscillator is 12MHZ. First, let the timer overflow once in 0.02S to make TF1=1. Then use I++ to loop 50 times, which adds up to 1S. The program is as follows:

#include
sbit LED = P1^2;
void main()
{ unsigned char i;
TMOD |= 0x10;
TMOD &= 0xdf;
TH1 = 0xb1;
TL1 = 0xdf;
TCON |= 0x40;
while(1)
{
  if(TF1==1)
  {
   TF1 = 0;
   TH1 = 0xb1;
   TL1 = 0xdf;
   i++;
    if(i==50)
    {
     i=0;
     LED=~LED;
    }
   }
}
}

Reference address：C language uses the timer method to control the LED light to flash at a speed of 1S

Previous article：Digital tube dynamic display
Next article：Single chip traffic light experiment

Popular Resources
Popular amplifiers