题目内容

A microcontroller with 64KB of code memory will require a program counter of ( )

A. 8-bit size
B. 16-bit size
C. 32-bit size
D. 64-bit size

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

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