A.interrupt B.sfr C.using D.while
A.3FH B.7DH C.07H D.F8H
A.數(shù)據(jù)寄存器寫入 B.數(shù)據(jù)寄存器讀出 C.指令寄存器寫入 D.忙信號(hào)讀出