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Key doorbell program

Publisher:数据舞者Latest update time:2018-01-10 Source: eefocus Reading articles on mobile phones Scan QR code
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Key doorbell program

;***** By pressing the 3rd button of the 1*4 button, you can hear the doorbell sound      
       T5 Hz  EQU 30H 
       T7HZ EQU 31H

       T05SA EQU 32H 
       T05SB EQU 33H 
       FLAG BIT 00H 
       STOP BIT 01H 
       SP1 BIT P1.0 
       ORG 0000H 
       LJMP START 
       ORG 000BH 
       LJMP INT_T0 
START:  MOV  TMOD,#02H 
        MOV  TH0,#06H 
        MOV  TL0,#06H 
       SETB ET0 
       SETB EA 
NSP:   JB SP1,NSP 
       LCALL DELY10MS 
       JB SP1,NSP 
       SETB TR0 
        MOV  T5HZ,#00H 
        MOV  T7HZ,#00H 
        MOV  T05SA,#00H 
        MOV  T05SB,#00H 
       CLR FLAG 
       CLR STOP 
       JNB STOP,$ 
       LJMP NSP 
DELY10MS:  MOV  R6,#20 
D1:     MOV  R7,#248 
       DJNZ R7,$ 
       DJNZ R6,D1 
       RET 
INT_T0:INC T05SA 
        MOV  A,T05SA 
       CJNE A,#100,NEXT 
        MOV  T05SA,#00H 
       INC T05SB 
        MOV  A,T05SB 
       CJNE A,#20,NEXT 
        MOV  T05SB,#00H 
       JB FLAG,STP 
       CPL FLAG 
       LJMP NEXT 
STP:   SETB STOP 
       CLR TR0 
       LJMP DONE 
NEXT:  JB FLAG,S5HZ 
       INC T7HZ 
        MOV  A,T7HZ 
       CJNE A,#03H,DONE 
        MOV  T7HZ,#00H 
       CPL P3.7 
       LJMP DONE 
S5HZ:  INC T5HZ 
        MOV  A,T5HZ 
       CJNE A,#04H,DONE 
        MOV  T5HZ,#00H 
       CPL P3.7 
       LJMP DONE 
DONE:  RETI 
       END


Reference address：Key doorbell program

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He Limin Column Microcontroller and Embedded Systems Bible

Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.

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