MCS-51的特殊功能寄存器分布在60H~80H地址范围内。()
A.00H～FFH
B.0000H～0FFFH
C.0000H～FFFFH
D.00H～7FH
试编写一程序，查找内部RAM单元的20H～50H中是否有0AAH这一数据，若有，则将51H单元置为01H，若没有，则使51H单元置0。
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89C51单片机内存地址7FH以内，从（）的地址单元具有位寻址功能。
执行LCALL 4000H指令时，80C51所完成的操作是（），4000H→PC.
MOVPSW，＃10H是将MCS－51的工作寄存器置为第（）区。
MCS-51上电复位时，SBUF=00H。（）
80C51复位后，PC与SP的值分别为（）