ddd.asm

此压缩包为AT89C51控制的电子门铃 包括keil文件包 以及PROTEUS的仿真 希望对初学者有所帮助

	 T5HZ                  EQU 30H 
T7HZ                  EQU 31H 
T05SA                EQU 32H 
T05SB                 EQU 33H 
FLAG                 BIT 00H 
STOP                  BIT 01H 
SP1                      BIT P3.7 
                            ORG 00H 
                            LJMP START 
                            ORG 0BH 
                            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 P1.0 
                            LJMP DONE 
S5HZ:                 INC T5HZ 
                            MOV A,T5HZ 
                            CJNE A,#04H,DONE 
                            MOV T5HZ,#00H 
                            CPL P1.0 
                            LJMP DONE 
DONE:                RETI 
                            END