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()