How should we understand the peripherals of 51 microcontroller? Do the following experiment.
Experiment 1: Experiment with external interrupt 0
Experimental steps: Connect one end of a DuPont cable to the P3^2 port, and the other end to the power supply or ground.
Experimental procedure:
#include
sbit led = P1^0;
void mian（void）
{ while（1）{
if（IE0）{
led = 0;
}
else{
led = 1;
}
}
}
Experimental results: When the other end of the DuPont line is connected to power, the LED goes out; when it is connected to ground, the LED lights up.
Conclusion: Regardless of whether it is configured or not, the external interrupt peripheral of the 51 microcontroller is working and cannot be disabled.
Experiment 2: Experiment with timer 0
Experimental procedure:
#include
sbit led = P1^0;
void main（void）
{
TR0 =1;
while（1）{
if（TF0 == 1）{
led = 0;
}
}
}
Experimental results: It was observed that the LED was lit
Conclusion: The 51 microcontroller CPU controls timer/counter 0 by TR0. When TR0 is 1, it works; when it is 0, it stops.
When overflow occurs, TF0 is set to 1; otherwise, it is set to 0.
A peripheral is a device other than the CPU that helps the CPU fully realize its functions.
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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