dingshiqi.rar_timer_定时功能_定时器 源代码

org 0000h ljmp start ORG 001BH ;INT T1 入口地址 lJMP INT_T1 ORG 0080H start: MOV SP,#60H mov 30h,#0 mov 31h,#0 mov 32h,#0 mov 33h,#0 mov 34h,#0 mov 35h,#0 mov 36h,#0 mov 37h,#0 MOV R3,#0H ;时 MOV R2,#0H ;分 mov r1,#0h ;秒 MOV R6,#0H ;标志 mov r7,#0h ;标志 MOV 38h,#0H ;标志 mov 39h,#0h ;标志 MOV TMOD,#10H MOV TL1,#00H ;50 mS 的时间常数 MOV TH1,#04CH MOV R0,#10 mov r4,#2 setb p2.7 SETB TR1 SETB ET1 SETB EA ;允许中断 loop: lcall scankey cjne r7,#0ffh,wait1 lcall display2 sjmp loop wait1: CJNE R6,#0FFH,wait LCALL DISPLAY1 MOV 34H,30H MOV 35H,31H MOV 36H,32H MOV 37H,33H sjmp loop wait: lcall display SJMP loop INT_T1: ;INT_T1中断服务子程序 PUSH DPH ;保护现场 PUSH DPL PUSH ACC PUSH PSW CLR TR1 MOV TL1,#00H ;50mS 定时常数 MOV TH1,#4CH SETB TR1 DJNZ R4,EXIT1 MOV R4,#2 mov a,30h CJNE a,#09h,s0 MOV 30h,#0 mov a,31h CJNE a,#9H,s1 MOV 31h,#0H mov a,32h CJNE a,#9H,s2 MOV 32h,#0H mov a,33h CJNE a,#9H,s3 MOV 33h,#0H s3: mov a,33h add a,#1 mov 33h,a s2: mov a,32h add a,#1 mov 32h,a s1: mov a,31H add a,#1 mov 31H,a s0: mov a,30H add a,#1 mov 30H,a DJNZ R0,EXIT1 ;判断毫秒=0 MOV R0,#10 ;DELAY 1 SECOND cpl p2.7 mov a,38h cjne a,#0ffh,next1 ljmp hour1 next1: mov a,39h cjne a,#0ffh,next2 ljmp minute1 next2: CJNE R1,#59H,SECOND ;判断秒=59 MOV R1,#99H minute1:CJNE R2,#59H,MINUTE ;判断分=59 MOV R2,#99H hour1:CJNE R3,#23H,HOUR ;判断时=23 MOV R3,#99H HOUR: MOV A,R3 ADD A,#1 ;时加1 DA A MOV R3,A mov a,38h cjne a,#00,exit1 MINUTE: MOV A,R2 ADD A,#1 ;分加1 DA A MOV R2,A mov a,39h cjne a,#00,exit1 SECOND: MOV A,R1 ADD A,#1 ;秒加1 DA A MOV R1,A EXIT1: mov 38h,#0h mov 39h,#0h POP PSW ;恢复现场 POP ACC POP DPL POP DPH RETI ;中断返回 DISPLAY: MOV A,R3 ANL A,#0FH mov dptr,#ledseg movc a,@a+dptr MOV P0,A ;MOV P2,#0fbh setb p2.0 clr p2.2 setb p2.1 setb p2.3 lcall delay MOV A,R3 SWAP A ANL A,#0FH mov dptr,#ledseg movc a,@a+dptr MOV P0,A setb p2.0 clr p2.3 setb p2.2 setb p2.1 ;MOV P2,#0f7h lcall delay MOV A,R2 ANL A,#0fH mov dptr,#ledseg movc a,@a+dptr MOV P0,A setb p2.1 clr p2.0 setb p2.2 setb p2.3 ;MOV P2,#0feh lcall delay MOV A,R2 SWAP A ANL A,#0FH mov dptr,#ledseg movc a,@a+dptr MOV P0,A setb p2.0 clr p2.1 setb p2.2 setb p2.3 ;MOV P2,#0fdh lcall delay RET display1: MOV A,30h mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0feh lcall delay MOV A,31h mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0fdh lcall delay MOV A,32H mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0fbh lcall delay MOV A,33H mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0f7h lcall delay RET display2: MOV A,34h mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0feh lcall delay MOV A,35h mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0fdh lcall delay MOV A,36H mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0fbh lcall delay MOV A,37H mov dptr,#ledseg movc a,@a+dptr MOV P0,A MOV P2,#0f7h lcall delay RET delay: ;延时子程序 PUSH 0 ;保存现场 PUSH 1 MOV 0,#1H DELAY1: MOV 1,#0FH DJNZ 1,$ DJNZ 0,DELAY1 POP 1 ;恢复现场 POP 0 RET scankey: setb p1.0 jb