本帖最后由 指尖螺 于 2020-5-13 15:32 编辑
最近在学单片机，用汇编写了一个时钟，程序如下
KEY_HH BIT P2.5
KEY_MM BIT P2.6
ORG 00H
LJMP START
ORG 0BH
LJMP INTT0
ORG 30H
START:
MOV 30H,#0
MOV 31H,#0
MOV 32H,#0
MOV 33H,#0
MOV TH0,#4CH
MOV TL0,#00H
MOV TMOD,#01H
MOV TCON,#10H
MOV IE, #82H
MOV R0,#10
MOV R1,#50 //??
MOV R2,#00 //??
MOV R3,#05 //?
MAIN: LCALL DISPLAY
JNB KEY_HH,SETHH
JNB KEY_MM,SETMM
AJMP MAIN
SETHH: LCALL DISPLAY
LCALL DISPLAY
JB KEY_HH,MAIN
KEY_REPAT: LCALL DISPLAY
JNB KEY_HH,KEY_REPAT
INC R3
CJNE R3,#24,MAIN_OUT
MOV R3,#0
MAIN_OUT:
MOV A,R3
MOV B,#10
DIV AB
MOV 30H,A
MOV 31H,B
AJMP MAIN
SETMM:
AJMP MAIN
DISPLAY:
MOV DPTR,#TAB
MOV A,33H
MOVC A,@A+DPTR
MOV P0,A
CLR P2.3
LCALL DL2MS
SETB P2.3
MOV A,32H
MOVC A,@A+DPTR
MOV P0,A
CLR P2.2
LCALL DL2MS
SETB P2.2
MOV A,31H
MOVC A,@A+DPTR
MOV C, 20H.0
MOV ACC.7,C
MOV P0,A
CLR P2.1
LCALL DL2MS
SETB P2.1
MOV A,30H
MOVC A,@A+DPTR
MOV P0,A
CLR P2.0
LCALL DL2MS
SETB P2.0
INTT0: MOV TH0,#4CH
MOV TL0,#00H
DJNZ R0,INTTOUT
MOV R0,#10
CPL 20H.0//1//1//0
JNB 20H.0,INTTOUT
CJNE R1,#00,INTTOUT_1
CJNE R2,#00,INTTOUT_1
CJNE R3,#06,INTTOUT_1
CLR P2.0
INTTOUT_1:
MOV A,R2
MOV B,#10
DIV AB
MOV 32H,A
MOV 33H,B
MOV A,R3
MOV B,#10
DIV AB
MOV 30H,A
MOV 31H,B
INC R1
CJNE R1,#60,INTTOUT
MOV R1,#0
INC R2
CJNE R2,#60,INTTOUT
MOV R2,#0
INC R3
CJNE R3,#24,INTTOUT
MOV R3,#0
INTTOUT:
RETI
DL2MS: MOV 34H,#20
DL1: MOV 35H,#30
DL2: DJNZ 35H,DL2
DJNZ 34H,DL1
RET
TAB: DB 0C0H;0
DB 0F9H;1
DB 0A4H;2
DB 0B0H;3
DB 099H;4
DB 092H;5
DB 082H;6
DB 0F8H;7
DB 080H;8
DB 090H;9 ;
END
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