at89c51双机通信keil代码

以下是基于AT89C51单片机的双机通信Keil代码示例：

发送端代码：

#include <reg51.h>

#define BAUDRATE 9600
#define FOSC 11059200L
#define TIMER_1_PRESCALER 12

sbit LED = P1^0;
sbit TXD = P3^1;

void init_serial() {
    TMOD &= 0x0F;
    TMOD |= 0x20;
    TH1 = TL1 = -(FOSC / (TIMER_1_PRESCALER * 32 * BAUDRATE));
    TR1 = 1;
    SCON = 0x50;
}

void send_byte(unsigned char byte) {
    SBUF = byte;
    while (!TI);
    TI = 0;
}

void main() {
    unsigned char data = 0x12;
    init_serial();
    while (1) {
        send_byte(data);
        LED = ~LED;
    }
}

接收端代码：

#include <reg51.h>

#define BAUDRATE 9600
#define FOSC 11059200L
#define TIMER_1_PRESCALER 12

sbit LED = P1^0;
sbit RXD = P3^0;

void init_serial() {
    TMOD &= 0x0F;
    TMOD |= 0x20;
    TH1 = TL1 = -(FOSC / (TIMER_1_PRESCALER * 32 * BAUDRATE));
    TR1 = 1;
    SCON = 0x50;
    ES = 1;
    EA = 1;
}

void receive_byte() interrupt 4 {
    unsigned char byte;
    if (RI) {
        byte = SBUF;
        RI = 0;
        LED = ~LED;
    }
}

void main() {
    init_serial();
    while (1);
}

这段代码实现了基于AT89C51单片机的双机通信，其中一个单片机发送数字，另一个单片机接收并用LED灯进行提示。