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英语翻译When the port is configured as an input port,the corresp

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英语翻译
When the port is configured as an input port,the corresponding bit is the pin state.When the port is configured as an output port,the pin state is the same as the corresponding bit.When the port is configured as functional pin,the undefined value will be read.
来自arm芯片的用户手册,求翻译.主要是pin state不懂是什么意思
把端口作为输入端口配置时,对应的比特为引脚状态,把端口作为输出端口配置时,引脚状态和对应的比特相同,端口作为功能型引脚配置时,可读出未定义值.