Serial communication program for two 51 single-chip microcomputers to communicate with each other

;51 MCU sends MCU program
; this program is simulated by Proteus

;This program has been tested on hardware
; 2007-05-27
; A simplified circuit diagram is attached
; In order to make it easier for beginners to understand, the program and diagram are as simple and concise as possible

;The experimental phenomenon is that which key of the P1 port of the transmitter is connected, and which light of the receiver is lit
; If the T and R of the two microcontrollers are expanded through a wireless module (such as a module based on the MCP2120 chip), wireless communication can be achieved.
                    ORG                  0000H
                    AJMP                 START
                    ORG                  0040H
START:
                    MOV                  SP,#60H        
                    MOV                  SCON,#50H                    ;Serial port mode 1
                    MOV                  TMOD,#20H                    ;T1 mode 2

                    MOV                  TL1,#0FDH                    ; constant of baud rate 9600
                    MOV                  TH1,#0FDH
                    SETB                 TR1   
                    mov                  r5,#00h                    
WAIT:
                    mov                p1,#0ffh
                    mov                a ,p1
                    mov                r5,a
                    lcall delay                       ; read keyboard, remove jitter here, and add a few words
                    mov                a ,p1
                     nop
                    CJNE                 A,5,WAIT                 ; whether there is key input
                    MOV                  SBUF,a                       ; serial port outputs the value of keyboard input
                    NOP
SS:                  JBC                  TI,WAIT                      ; whether the sending is completed
                    SJMP                 SS
DELAY:                                       ; delay subroutine
                    PUSH                 0                            ; save the scene
                    PUSH                 1
                    MOV                  0,#06H
DELAY1: MOV                  1,#0H
                    DJNZ                 1,$
                    DJNZ                 0,DELAY1
                    POP                  1                            ; restore the scene
                    POP                  0
                    RET
                    END

;The system crystal oscillator is 11.0592 MHz
;51 MCU receives the MCU program
;This program is simulated by Proteus

;This program has been tested on hardware
; 2007-05-27
; A simplified circuit diagram is attached
; In order to make it easier for beginners to understand, the program and diagram are as simple and concise as possible

;The experimental phenomenon is that which key of the P1 port of the transmitter is connected, and which light of the receiver is lit
; If the T and R of the two microcontrollers are expanded through a wireless module (such as a module based on the MCP2120 chip), wireless communication can be achieved.
                    ORG                  0000H
                    AJMP                 START
                    ORG                  0040H
START:        
                    MOV                  SCON,#50H                    ;Serial port mode 1
                    MOV                  TMOD,#20H                    ;T1 mode 2

                    MOV                  TL1,#0FDH                    ; constant of baud rate 9600
                    MOV                  TH1,#0FDH
                    SETB                 TR1           
                   WAIT:
                    JBC                  RI,DIS_REC                   ; whether data is received        
                    sjmp                 wait
DIS_REC:
                    MOV                  A,SBUF                       ; read the data received by the serial port         
                    mov                  p1,a
                    SJMP                 wait
                    end