51 MCU simulation decoding 2272 program

The following is a software simulation PT2272 decoding program, which is simply posted here for your reference. 
  Software decoding program (simulation PT2272) ; ;The crystal frequency is 11.0592MHz ;
  The time positioning relationship in this program is only applicable to the decoding of PT2262 connected to a 3.3M oscillation resistor;
  When using other resistance values, the positioning time should be scaled according to the resistance ratio; In the following program, REM is the signal input terminal;
  RECEIVE detects a valid signal flag;

  ENABLE_DETE continuous key flag;
  3AH, 3BH are used as timers; ;
  PT2262 has 12 address lines; ;31H, 32H: the first 8 bits of address code received; ;33H, 30H: the last 4 bits of address code received (if the last 4 bits are used as the data terminal, only the content of the 33H unit needs to be read);
  When used as a data terminal, the corresponding pin of PT2262 is left floating and is considered to be a low level. ;Address data description; ;Take 31H.0 and 32H.0 as an example; ;Floating: 31H.0=0 32H.0=1 ; ; 1: 31H.0=1 32H.0=1 ; ; 0: 31H.0=0 32H.0=0 ; ;Error 31H.0=1 32H.0=0 ; ; ;
   Description: In order to reliably detect the valid signal, it is recommended to detect at least 3 times each time receiving, and then compare the 3 detection values; only when the 3 values ​​are the same can it be considered that the correct signal has been received. It can be processed as follows in the main program: Call REMOTE for the first detection; Call REMOTES for the second and third detections. Please note that it must be called continuously, otherwise the correct data will not be obtained; ;
  Note: Set T1 as a 16-bit timer and allow interrupts, otherwise it will cause data reception errors;---------------------------------------;
 REMOTE: ; CLR RECEIVE ; ;Check whether there is any code reception within 50ms;
           MOV 3AH,#55 ; 
 REMOTEA: ; 
          MOV 3BH,#250 ; 
 REMOTEB: ; 
         JB REM,REMOTE0 ;If there is a code to send, jump 
         DJNZ 3BH,REMOTEB ;
         DJNZ 3AH,REMOTEA ; 
 REMOTE_END_1: ;
          CLR ENABLE_DETE ; 
 REMOTE_END: ​​; 
          CLR REMOTING ;Clear probe detection flag 
          RET ; 
  REMOTE0: ; 
         JB ENABLE_DETE,REMOTE_END_1; Return to 
   REMOTES if the key is not released: MOV 34H,#12; Receive 12-bit code; Decode; ; First find the beginning of the received code, which is the high level of 10ms; ; Set the high level time to 8~12ms; ; Detect and wait for 8ms of low level, 70ms threshold; 
        CLR T_OVER; 
        MOV TH1,#00H; 
        MOV TL1,#00H; 
        SETB TR1;
  REMOTE1:; 
        MOV 3AH,#50; 
  REMOTE2:; 
        MOV 3BH,#25; 
 REMOTE3:; 
        JB REM,REMOTE1; 
        JB T_OVER,REMOTE_END;
        DJNZ 3BH,REMOTE3; 
        DJNZ 3AH,REMOTE2;; ; Wait for the high level received within 4ms; 
        CLR T_OVER ; 
        MOV TH1,#0F1H ; 
        MOV TL1,#0F0H ; 
        SETB TR1 ; 
  REMOTE_4: ; 
        JB T_OVER,REMOTE_5 ;
        JNB REM,REMOTE_4 ;
        CLR TR1 ; 
        AJMP REMOTE6 ; ;Exceed 12ms, receive error return; 
 REMOTE_5: ; 
       AJMP REMOTE_END ; 
       REMOTE6: ; ;Wait for 550us and collect receive signal; 
       MOV 3AH,#00 ; 
       DJNZ 3AH,$ ; ;Collect receive signal and record;
       MOV C,REM ;
       MOV A,33H ; 
       RLC A ; 
       MOV 33H,A ; 
       MOV A,31H ;
       RLC A ; 
       MOV 31H,A ; ;Wait for the second rising edge, time limit 1.5ms ; 
       CLR T_OVER ;
       MOV TH1,#0FAH ; 
       MOV TL1,#099H ; 
       SETB TR1 ;
 RM1: JB T_OVER,REMOTE_END ;
       JB REM,RM1 ;
       CLR TR1 ; ; 
       CLR T_OVER ;
       MOV TH1,#0FAH ;
       MOV TL1,#099H ; 
       SETB TR1 ; 
 RM2: JB T_OVER,REMOTE_END ; 
       JNB REM,RM2 ; 
       CLR TR1 ; ;Wait for 550us and then collect the received signal; 
       MOV 3AH,#00 ; 
       DJNZ 3AH,$ ; 
       MOV C,REM ;

       MOV A,30H ; 
       RLC A ;
       MOV 30H,A ;
       MOV A,32H ;
       RLC A ; 
       MOV 32H,A ; ;Wait for the rising edge of the second code value; 
       CLR T_OVER ;
       MOV TH1,#0FAH ; 
       MOV TL1,#099H ;
       SETB TR1 ; 
 RM3: JB T_OVER,RM5 ; 
      JB REM,RM3 ;
      CLR TR1 ; ; 
      CLR T_OVER ; 
      MOV TH1,#0FAH ; 
      MOV TL1,#099H ; 
      SETB TR1 ; 
 RM4: JB T_OVER,RM5 ; 
      JNB REM,RM4 ;
      CLR TR1 ; 
      DJNZ 34H,REMOTE6 ; ;Shift the received code left by 4 bits and put the 8-bit password on the same byte
      MOV 34H,#4 ; 
      AJMP REMOTE7 ;
 RM5: AJMP REMOTE_END ;
 REMOTE7: ;

      CLR C ; 
      MOV A,33H ; 
      RLC A ;
       MOV 33H,A ; 
      MOV A,31H ; 
      RLC A ; 
      MOV 31H,A ; 
      CLR C ;
      MOV A,30H ; 
      RLC A ; 
    MOV 30H,A ; 
    MOV A,32H ;
    RLC A ; 
    MOV 32H,A ; 
    DJNZ 34H,REMOTE7 ; ;Move the 4-bit data code from the high 4 bits to the low 4 bits;
    MOV A,33H ; 
    SWAP A ; 
    MOV 33H,A ;
    MOV A,30H ; 
    SWAP A ; 
    MOV 30H,A ; 
    SETB ENABLE_DETE ; 
    SETB RECEIVE ; ; 
    AJMP REMOTE_END_1 ;
 END;