51 serial communication (on)

51 can realize the communication between the single-chip microcomputer and the computer, that is, control the single-chip microcomputer to realize some functions through the data transmission between the two

There is already a small tool called Serial Assistant in stc to help us realize serial communication

The receiving area is used to receive the data sent by the single-chip microcomputer to the computer, and the sending area is used for the computer to send the data to the single-chip computer.

The following is the related knowledge of serial port. For the specific content, you can watch the teaching video of Jiangxi Association for Automation 51 MCU at station B to understand

void UART_SendByte(unsigned char Byte);
void UART_Init();

Here we need to write two functions to realize the initialization of the serial port and the function of the computer to receive the data sent by the microcontroller

void UART_SendByte(unsigned char Byte){SBUF=Byte;while(TI==0){TI=0;}}void UART_Init(){SCON=0x40;PCON=0x80;TMOD &= 0x0F;TMOD |= 0x20;TL1=0xF4;TH1=0xF4;TF0=0;TR1=1;ET1=0;EA=1;PT0=0;}

Main function

unsigned char Sec;void main(){UART_Init();while(1){UART_SendByte(Sec);Sec++;Delay(1000);}}

This process is actually still sent by the computer to the microcontroller and then sent back to the computer by the microcontroller, so the effect of the operation is that the computer receives the binary number returned by the microcontroller and increases from 00

Then the computer sends data to the microcontroller and I will explain it next time