急求!!!哪位朋友指点下单片机程序题~~答:CLR C MOV A,#9AH SUBB A,R1 ;减数十进制求补 ADD A,R0 DA A MOV R2,A ;差值送R2 JC POSI ;C=1,表示差值为正 NEGA: MOV A,#9AH ;差值为负,求补后得差值的绝对值 SUBB A,R2 MOV R2,A SETB 20H.5 ;显示负号标记 POSI: MOV OUT_H,#00H MOV OUT_L,R2 CALL T_CONV RET;---;乘法...
单片机求编写程序,C51答:(5)(20H)=0EH,P=1(6)(A)=EFH,(20)=08H13.答:(A)=3BH,(R0)=40H,(40H)=00H,(41H)=3BH,(42H)=3BH。14.答:(1)SETB ACC.0(2)ANL A,#0FH(3)ANL A,#87H15.答:MOV 2FH,20H MOV 2EH,21HMOV 2DH,22H16.答:CLR CYMOV 30H,#7FHMOV 31H,#4DHMOV R0, #31HMOV A,@R0SUBB A...
汇编习题求解答:它依次表示0-9,a-f这16个数码的显示代码,现编写一个程序实现将lednum中的一个数字(0-9,a-f)转换成对应的led显示代码.答:程序如下 stack segment stack db 100h dup(?)stack ends data segment ledtable db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h db 80h,90h,88h,83h,0c6h,0c1h...
单片机电子钟程序答:alarm1_out: clr 20h.2 pop acc reta_num_inc: inc 29h mov a,29h anl a,#0fh cjne a,#3,alarmnum anl 29h,#0 ajmp alarmnumalar_adj_1: setb 20h.2 acall daa orl 21h,#10h acall disp anl 21h,#0fh acall key_scanf mov a,70h jb acc.1,hadj_1 jb acc.2,minc_1 ajmp alar...