• 2022-10-30
    减法指令“subR1,R2,R3”的功能为“(R1)-(R2)→R3,该指令执行后将生成进位/借位标志CF和溢出标志OF。若(R1)=FFFFFFFFH,(R2)=FEFFFFF0H,则该减法指令执行后,CF与OF分别为()
    A: CF=0.OF=0
    B: Cf=1,OF=0
    C: CF=0,OF=1
    D: CF=1,OF=1