Single chip microcomputer output matrix wave experiment-EEWORLD

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The original intention of this program is to output a matrix wave, but if you run it with a microcontroller experimental board, you will find that it seems that P1^1 (that is, the second LED tube is always glowing) is not because of a problem with the program that makes it always on, but because the frequency of the pass segment is too fast for the human eye. According to the persistence of vision, it will appear that the LED is always on. I also had this suspicion at the beginning. You can modify the program to make the frequency of the pass segment lower, and you can see that it is actually always working. The program after the comment symbol is the modified program;

#include
#define uint unsigned int
#define uchar unsigned char
sbit D1=P1^1; //uint i=0;
void main()
{
TMOD=0x01;
TH0=(65536-50000)%256;
TL0=(65536-5000)/256;
EA=1;

ET0=1;
TR0=1;
while(1)
{
while(TF0==0) //if(TF0==0) i++;
{ //if(i==10)
D1=~D1; //{ D1 =~D1; }
}
}
}
void timer0() interrupt 1
{
TH0=(65536-5000)/256;
TL0=(65536-50000)%256;
}

After the change, the program becomes: But the timer overflows ten times and the interrupt runs, that is, twenty overflows are one cycle of this matrix wave.

Keywords：MCU Reference address：Single chip microcomputer output matrix wave experiment

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