单片机带应急的交通灯控制实验程序(汇编).doc

单片机带应急的交通灯控制实验（汇编）org 00hajmp mainorg 0003hajmp int_red_we equ p1.1yel_we equ p1.2gre_we equ p1.3red_sn equ p1.5yel_sn equ p1.6gre_sn equ p1.7org 0030hmain:mov sp ,#65hcall init_intclr red_weclr red_sncall delay3loop:clr gre_wesetb red_wecall delay5setb gre_weclr yel_wemov r4,#10sight:call delay_200mscpl yel_wedjnz r4,sightsetb yel_wecall delay_200msclr gre_snsetb red_snclr red_wecall delay5setb gre_snclr yel_snmov r4,#10sight1: call delay_200mscpl yel_sndjnz r4,sight1setb yel_snclr red_snclr red_wecall delay_200mssjmp loop ;中断服务程序;int_:push pswpush 04hsetb gre_snsetb yel_snsetb gre_wesetb yel_weclr red_snclr red_wecall delay5call init_intpop 04hpop pswreti;外部中断初始化;init_int:setb ex0setb it0setb earet;5秒延时;delay5:mov r4,#5delay5_:call delay_1sdjnz r4,delay5_ret;3秒延时;delay3:mov r4,#3delay3_:call delay_1sdjnz r4,delay3_ret;0.2秒延时;delay_200ms:mov r5,#20s:call delay_10msdjnz r5,sret ; 非中断精确1MS定时程序 ;delay_1ms:push 07hMOV R7 ,#249 signed: ;循环部分4机器周期nop nopdjnz R7 ,signedpop 07hret;返回指令2机器周期 ;2+249*4+2=1000us 可以精确定时1MS，假设外部晶振是12M; 非中断精确10MS定时程序 ;delay_10ms:push 06hmov r6,#9;2个机器周期用2us delay_10ms_sined:;9次循环共用9(1ms+4us)=9036usacall delay_1msdjnz r6,delay_10ms_sinedMOV r6 ,#240 ;2个机器中期用2ussigned_10ms: ;循环部分4机器周期 共240次nop nopdjnz r6 ,signed_10mspop 06hret ;返回指令要2us;2us+9036us+240*4us+2us = 10ms 即可精确定时10ms; 非中断精确定时1s ;delay_1s:push 05hmov r5,#99;两个机器周期2usdelay_1s_signed: ;循环指令周期为4us，加上延时10ms;(10ms+4us)*99 = 990.396msacall delay_10msdjnz r5,delay_1s_signedmov r5 ,#9;两个机器周期2ussigned_1s: ;循环指令周期为4us，加上延时1ms;(1ms+4us)*9 = 9ms+36usacall delay_1msdjnz r5 ,signed_1smov r5 ,# 140;机器周期2ussigned_1s_: ;一次循环4us共有140次。140us*4 = 560usnopnopdjnz r5,signed