Question

X和Y皆为8位无符号二进制数,分别存在外部RAM的2000H和2001H 单元中,

Answer 1

1.MOV DPTR,#2000H ;设置地址MOVX A,@DPTR ;取数XMOV 20H,A ;暂存RL A ;乘以2ADD A,20H ;加上原数,即乘以3MOV 20H,A ;暂存3XINC DPTR ;下一个地址MOVX A,@DPTR ;取数YRL A ;乘以2ADD A,20H ;3X+2YMOV 20H,A ;Z=3X+2Y...