题目内容

The microcontroller is useful in systems that have fixed programs for dedicated applications. ( )

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8-bit CPU means this CPU can recognize and process eight bits at a time. ( )

Data bus must be bi-directional because it has to write as well as read data to/from memory or peripherals. ( )

8051在读一个I/O端口的引脚输入之前,先往对应的引脚锁存器输出了0,则读到的数据值将为()。

A. 0
B. 1
C. 取决于引脚所接的外部输入

使用8031单片机时,需要将/EA引脚接()电平,因为片内无()存储器。()

A. 高,数据
B. 高,程序
C. 低,数据
D. 低,程序