The following program can achieve a relatively accurate delay at the ms level:
Reference address：51 single chip microcomputer C51 accurate delay
void Delayms(unsigned int n)
{
unsigned int i,j;
for(j=n;j>0;j--)
for(i=112;i>0;i--);
}
Use keil to see the delay time. Let’s delay for 1ms first (Delayms(1)).
Before entering Delayms, sec=0.00042209s
After delay, sec=0.00142253s
It can be known that the actual delay of Delayms (1) is 0.00142253s-0.00042209s=0.00100044s≈1ms
Similarly, if you want to delay for 15ms, use Delayms(15). The actual delay is 0.01480903s≈15ms, which is quite accurate.
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