When the M8C reads the PRTxDR register address, the current value of the pin voltage
is translated into a logic value and returned to the M8C.Note that the pin voltage can represent a different logic value than the last value written to the PRTxDR register.
This is an important distinction to remember in situations such as the use of a read modify write to a PRTxDR register.
这段话具体是什么意思？
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