51 MCU Series Serial Port-EEWORLD

----------------------------------------------------

Name: 51 MCU with built-in serial port

Platform: Keil 4, Ly-51S learning board

The pin definitions are as follows: RXD TXD

MAX232 and 51 connection: TXD-T1IN RXD-R1OUT

-----------------------------------------------------*/

#include

/*Serial port initialization*/

void UART_init() {

SCON = 0x50; // SCON: Mode 1, 8-bit UART, receive enabled

TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit 重装

TH1 = 0xFD; // TH1: reload value 9600 baud rate crystal 11.0592MHz

TR1 = 1; // TR1: timer 1 is turned on

EA = 1; // Enable general interrupt

}

/*Send a byte*/

void UART_send_byte(unsigned char dat) {

SBUF = dat;

while(!IF)

;

IF = 0;

}

/*Send a string*/

void UART_send_str(unsigned char *s) {

while(*s != '\0') {

UART_send_byte(*s);

s++;

}

void main() {

UART_init();

while(1) {

UART_send_str("hellofuxin");

}

Reference address：51 MCU Series Serial Port

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