51单片机汇编语言 编乘法和除法子程序答:;(r3r2r1r0) = (r7r6) * (r5r4), r4-r7 unchanged mul_word:mov b,r6 mov a,r4 mul ab mov r0,a mov r1,b mov r2,#0 mov r3,#0 mov a,r7 mov b,r4 mul ab add a,r1 mov r1,a mov a,r2 addc a,b mov r2,a clr a addc a,r3 mov r3...
汇编语言程序求补充,用子程序统计输入的数字0-9的个数,以十进制在屏幕...答:assume cs:code,ds:data start: mov ax,ds mov ds,ax mov dx,offset buf mov ah,0ah '调用DOS10号功能 int 21h count: mov cl, [buf+1] '取实际长度 mov bx,offset buf inc bx inc bx ' bx 指向第一个字符 cnt: cmp [bx],30H jb next cmp [bx],39H ja ...