Proteus and Keil Cx51 microcontroller simulation (serial port simplex communication 2)

Circuit Diagram:

U1 Program:

#include//Includes the header file of the microcontroller register
sbit p=PSW^0;
unsigned char receive(void)//Receive a byte of data
{
unsigned char dat;
while(RI==0);
RI=0;//As long as the receive interrupt flag RI is not set to 1, wait until the reception is completed (RI1)
ACC=SBUF;//Store the data in the receive buffer in dat
if(RB8==P)//Odd parity
{dat=ACC;return dat;}
}
void main(void)
{
unsigned char i;
TMOD=0x20;//Timer T1 works in mode 2
SCON=0xd0;//SCON=1101 0000B, serial port working mode 1, allow reception (REN=1)
PCON=0x00;//PCON=0000 0000B, baud rate 9600
TH1=0xfd;TL1=0xfd;//Assign initial value to timer T1 according to regulations
TR1=1;//Start timer T1
REN=1;//Allow receiving
while(1)
{
for(i=0;i<9;i++)P1=receive();//Send data to P1 port
for(i=0;i<9;i++)P0=receive();//Send data to P0 port
for(i=0;i<9;i++)P2=receive();//Send data to P2 port
}
}

U2 Program:

#include//Header file including microcontroller registers
sbit p=PSW^0;
unsigned char code Tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xff,0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xff,0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xff};//Flowing light control code, the data is defined as a global variable
void send(unsigned char dat)//Send a byte of data to PC
{
ACC=dat;
TB8=p;
SBUF=dat;
while(TI==0);//Send and wait for
TI=0;
}
void delay(void)//delay about 150ms
{
unsigned char m,n;
for(m=0;m<200;m++)for(n=0;n<250;n++);
}
void main(void)
{
unsigned char i;
TMOD=0x20;//TMOD=0010 0000B, timer T1 works in mode 2
SCON=0xc0;//SCON=1100 0000B, serial port works in mode 3, SM2 is set to 0, multi-machine communication is not used, TB8 is set to 0
PCON=0x00;//PCON=0000 0000B, baud rate 9600
TH1=0xfd;TL1=0xfd;//assign initial value to timer T1
TR1=1;//start timer T1
while(1)
{
for(i=0;i<27;i++)//simulate detection data
{
send(Tab[i]);//send data i
delay();//send detection data once every 50ms
}
}
}