http://zhidao.baidu.com/question/202923220.html
流水灯汇编程序
ORG 0000H
SJMP START
ORG 0003H
SJMP X0_INT
ORG 000BH
SJMP T0_INT
;-------------------------------------------
START:
MOV TMOD, #01H
MOV TH0, #(65536 - 50000) / 256; //定时50ms@12MHz
MOV TL0, #(65536 - 50000) MOD 256; //定时50ms@12MHz
SETB TR0
SETB ET0
SETB IT0
SETB EX0
如枝SETB PT0
SETB EA
MOV R3, #20
MOV R2, #7FH
MOV P1, R2
SJMP $
渣橡敏 ;-------------------------------------------
X0_INT:
CPL F0
JNB P3.2, $ ;等待按键释放
RETI
;-------------------------------------------
T0_INT:
MOV TL0, #(65536 - 50000) MOD 256; //定时50ms@12MHz
MOV TH0, #(65536 - 50000) / 256; //定时50ms@12MHz
DJNZ R3, T0_END
MOV R3, #20
MOV A, R2
JNB F0, DDD
RL A
SJMP EEE
DDD:
RR A
EEE:
MOV R2, A
MOV P1, A
T0_END:
RETI
;-------------------------------------------
如搏END
安徽国科职院
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