Question

用汇编语言编写跑马灯程序

单片机为AT89c51型，八个跑马灯接P1口，开始是1357灯亮，延迟400ms，接着是2468灯亮，延时…一直循环下去，程序要有简略说明…不要用c语言编写
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Answer 1

跑马灯程序用汇编是很好实现的，只要用好循环移位指令就可以，以下是程序。
ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV A,#0FEH

LOOP:
MOV P1,A ；将控制字送端口

RL A ；控制字循环左移

LCALL DELAY ；延时

SJMP LOOP

DELAY: ;延时大概1秒
MOV R2,#10

DLY1:
MOV R3,#200
DLY2:
MOV R4,#250

DJNZ R4,$

DJNZ R3,DLY2

DJNZ R2,DLY1

RET

END

Answer 2

CSEG AT 0000H
LJMP START
CSEG AT 401BH
LJMP INT
CSEG AT 4100H
START: MOV A,#01H
MOV R1,#03H
MOV R0,#5H
MOV TMOD,#10H
MOV TL1,#57H
MOV TH1,#9EH
ORL IE,#88H
SETB TR1
LOOP1: CJNE R0,#00,DISP
MOV R0,#5H
INC R1
CJNE R1,#27H,LOOP2
MOV R1,#03H
LOOP2: MOV A,R1
MOVC A,@A+PC
JMP DISP
DB 01H,03H,07H,0FH,1FH,3FH,7FH,0FFH,0FEH,0FCH
DB 0F8H,0F0H,0E0H,0C0H,80H,00H,0FFH,00H,0FEH
DB 0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH,0BFH,0DFH
DB 0EFH,0F7H,0FBH,0FDH,0FEH,00H,0FFH,00H
DISP: MOV P1,A
JMP LOOP1
INT: CLR TR1
DEC R0
MOV TL1,#57H
MOV TH1,#9EH
SETB TR1
RETI
END

Answer 3

START:MOV A,#0AAH;初次1357灯亮
LOOP :MOV P1,A
LCALL DELY
LCALL DELY ;调200mS延时
RL A
SJMP LOOP
DELY:MOV R7,#200
DELY1:MOV R6,#200
DELY2:NOP
NOP
NOP
DJNZ R6,DELY2
DJNZ R7,DELY1
RET

Answer 4

ORG 0600H
MOV A，#55H
LOOP： MOV P1，A
LCALL DEL
RL A
SJMP LOOP
DEL： MOV R7，#250
DEL1： MOV R6，#198
DJNZ R6，$
DJNZ R7，DEL1
RET
END