Initial STC89C52RC microcontroller experiment

The previous AT89S52 experimental board needed parallel port programming, while the STC could be programmed via serial port. I read the book "Fall in Love with Microcontrollers", which introduced a homemade USB programming cable and used a USB to UART interface module (implemented by CP2102 chip) - the module has 5V and 3.3V power outputs for the microcontroller. Then I went to find a USB-serial port module implemented by PL2303 for sale. It was also very convenient to connect, a minimum system,

 

This picture is modified by myself from the picture in Du Yang's book. This is the minimum system. A diode is connected to the 37th pin to control the flashing. An STC89C52RC, a PL2303USB to serial port module, a 10uF electrolytic capacitor and a 10K ohm resistor form the reset circuit, two ceramic 30pF capacitors and a 11.0592 crystal oscillator form the oscillation circuit, and a light-emitting diode and 220 ohms form the flashing light verification program. 9 components, 9 pins on the microcontroller.

Download the STC-ISP programming program, default settings, first disconnect the +5V of STC89C52RC, open the hex file to be written, press download, wait for the prompt, connect the +5V, and start programming. If successful, the light will start flashing.

After backing up the UV3.CDB of keic3, replace it with the UV3.CDB described in the STC official website. Then you can select the STC89C52RC model. The following is the C program for the flashing light:

#include

#define uchar unsigned char

#define LED P0
void delay(int);

void main()
{
 LED = 0xff;
 while(1)
 {
  LED=~LED;
  delay(200);
  LED=~LED;
  delay(200); //This can be set longer, the pattern of the light flashing will change

 }
}

void delay(int x)
{
 int i,j;
 for(i =0;i   for(j = 1;j<=600;j++);
}

It's quite simple. Just wrap the copper wire around the pins, just like the electromagnet experiment we did when we were kids. As for other things like digital tubes controlling motors, servos and relays, programming is easy as long as you don't burn the microcontroller.