一個51單片機匯編語言的程序，要求就是紅燈25秒，綠燈20秒，黃燈閃爍5秒。

很簡單的要求，用下圖電路即可實現：

全部程序如下：

;倒計時交通燈

;四位共陽數碼管

;P0?接段碼

;P2.0123?接位碼

;P3?接紅綠黃燈

NB_R???EQU??P3.0

NB_Y???EQU??P3.1

NB_G???EQU??P3.2

DX_R???EQU??P3.3

DX_Y???EQU??P3.4

DX_G???EQU??P3.5

;-------------------------------------------

ORG???0000H

JMP???MAIN

ORG???000BH?????????;T0中斷的入口地址

MOV???TL0,?#0B0H

MOV???TH0,?#3CH?????;50ms中斷一次

DJNZ??R2,?EXIT_T0

MOV???R2,?#20???????;定時1s

DEC???R3????????????;倒計時

DEC???R4????????????;倒計時

EXIT_T0:

RETI

;***************************************

MAIN:

MOV???TMOD,?#01H

MOV???TH0,?#3CH?????;定時50ms

MOV???TL0,?#0B0H

MOV???R2,?#20???????;定時1s

SETB??TR0

SETB??ET0

SETB??EA

MOV???SP,?#60H

;***************************************

N_B:????????????????????;南北

MOV???P3,?#0????????;關閉全部紅綠燈

SETB??NB_G

SETB??DX_R

MOV???R3,?#20???????;南北通行時間

MOV???R4,?#25

NB_W1:

CJNE??R3,?#0,?NB_DISP

MOV???R3,?#5????????;南北黃燈時間

SJMP??N_B_Y

NB_DISP:

CALL??DISPLAY

SJMP??NB_W1

;-----------------------

N_B_Y:

CLR???NB_G

NB_W2:

CJNE??R4,?#0,?NB_DISP2

JMP???D_X

NB_DISP2:

MOV???A,?R2

MOV???C,?ACC.3

MOV???NB_Y,?C

CALL??DISPLAY

SJMP??NB_W2

;***************************************

D_X:

MOV???P3,?#0????????;關閉全部紅綠燈

SETB??DX_G

SETB??NB_R

MOV???R3,?#25

MOV???R4,?#20???????;東西通行時間

DX_W1:

CJNE??R4,?#0,?DX_DISP

MOV???R4,?#5????????;東西黃燈時間

SJMP??D_X_Y

DX_DISP:

CALL??DISPLAY

SJMP??DX_W1

;-----------------------

D_X_Y:

CLR???DX_G

DX_W2:

CJNE??R3,?#255,?DX_DISP2

JMP???N_B

DX_DISP2:

MOV???A,?R2

MOV???C,?ACC.3

MOV???DX_Y,?C

CALL??DISPLAY

SJMP??DX_W2

;***************************************

DISPLAY:

MOV???DPTR,?#TAB1

MOV???A,?R3

MOV???B,?#10

DIV???AB

MOVC??A,?@A?+?DPTR

MOV???P0,?A

MOV???P2,?#1

DJNZ??R7,?$

DJNZ??R7,?$

MOV???P2,?#0

;----------------------

MOV???A,?B

MOVC??A,?@A?+?DPTR

MOV???P0,?A

MOV???P2,?#2

DJNZ??R7,?$

DJNZ??R7,?$

MOV???P2,?#0

;----------------------

MOV???A,?R4

MOV???B,?#10

DIV???AB

MOVC??A,?@A?+?DPTR

MOV???P0,?A

MOV???P2,?#4

DJNZ??R7,?$

DJNZ??R7,?$

MOV???P2,?#0

;----------------------

MOV???A,?B

MOVC??A,?@A?+?DPTR

MOV???P0,?A

MOV???P2,?#8

DJNZ??R7,?$

DJNZ??R7,?$

MOV???P2,?#0

RET

TAB1:

DB??0C0H,?0F9H,?0A4H,?0B0H,?99H

DB???92H,??82H,?0F8H,??80H,?90H

;***************************************

END

;-------------------------------------------

總結

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