8051单片机的XTAL1和XTAL2引脚是( )引脚。
A. 外接定时器
B. 外接串行口
C. 外接中断
D. 外接晶振
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8051单片机ALE引脚是( )引脚。
A. 地址锁存使能输出端
B. 外部程序存储器地址允许输入端
C. 串行通信口输出端
D. 复位信号输入端
下列哪个引脚可以作为中断请求输入线( )。
A. P3.0
B. P3.2
C. P3.5
D. P3.4
RST(9)引脚必须加两个机器周期以上的高电平才有效。
A. 对
B. 错
migratedeadlydumpmake upleak1. Cancer is a __________ disease.2. In some developing countries, more and more people ___________to urban area.3. Sealed containers of nuclear waste have been____________ in the sea.4. The details were supposed to be secret but somehow____________out.5. North Africans __________ the largest immigrant(移民)group in the country.