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FTDI is the manufacturer of (a.o.) a popular UART to USB bridge.

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I'm designing a board that needs to be programmable via USB and external TX/RX pins. I decided to use FT232RL ( http://www.sparkfun.com/datasheets/DevTools/Arduino/FTDI%20Basic-v21-5V.pdf ) for the … USB interfacing. For the external RX-TX pins, do I need any logic or jumpers to disable the FTDI chip, or simply if there's no D-,D+ signals, I can use external RX and TX pins, that are connected to both MCU and FTDI, without FTDI chip interfering. Any help is greately appreciated. …
asked Apr 12 '15 by mozcelikors