一个存储器地址是由输出到适宜的总线上的二进制数据所组成。这个总线我们称为地址总线。
A memory address consists of binary data being output on an appropriate bus which we call the address bus.
端口0也是复低位地址和在利用外部程序和数据存储器的数据总线。
Port 0 is also the multiplexed low-order address and data bus during access to external program and data memory.
对微控制器而言，PDIUSBD12看起来就像一个带8位数据总线和一个地址位（占用两个位置）的存储器件。
To a micro-controller, the PDIUSBD12 appears as a memory device 8-bit data bus and 1 address bit (occupying 2 locations).
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