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What pin is required if the transmitter's TXD pin is set to N-channel ?

Latest Updated:10/10/2008

Question:

(Serial Interface)  When transmitting using asynchronous serial I/O (UART), if the transmitter's TXD pin is set to N-channel open drain output mode, what pin handling is required? [2008/10/10]

Answer:

An external pull-up resistor is required between TXD and the supply voltage. (#107149)
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