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89C52 MCU serial port receiving and sending data

Publisher:RadiantDuskLatest update time:2022-10-11 Source: csdnKeywords：89C52 Reading articles on mobile phones Scan QR code
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1 Introduction

Send data to the microcontroller through the serial port, and then the data + 1 is returned to the serial port

insert image description here

2. Function Implementation


#include


#define uchar unsigned char

#define uint unsigned int


sbit beep = P2^3; //Buzzer interface

uchar num; //Send temporary variable


void delay(uint z)

{

uint x,y;

for(x = z; x > 0; x--)

for(y = 114; y > 0 ; y--);

}

void UART_init()

{

TMOD = 0x20;  //T1 working mode 2 8-bit automatic reload

TH1 = 0xfd;

TL1 = 0xfd; //bit rate 9600 

TR1 = 1; //Start T1 timer

SM0 = 0;

SM1 = 1; //Serial port working mode 1 10-bit asynchronous

REN = 1; //Serial port allows receiving

EA = 1; // Enable general interrupt

ES = 1; //Serial port interrupt is turned on

}

void main()

{

UART_init(); //Serial port initialization

while(1);

}



void UART() interrupt 4 //Serial port interrupt

{

if(RI) //Check whether the reception is completed. When the hardware receives a data, RI is high.

{

num = SBUF;   //num takes out the value of the receive buffer

beep = 0;

delay(100);

beep = 1; //The buzzer emits a beeping sound

num++; //add 1 to the received data and send it

RI = 0;

SBUF = num;   //Return data to the buffer

while(!TI);

TI = 0;

}

}

Keywords：89C52 Reference address：89C52 MCU serial port receiving and sending data

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