Datasheet

FTDI Breakout

At the bottom is 6 pins in a row that we call the FTDI header. You can use these pins to

program the Pro Trinket with an FTDI cable or FTDI Friend. You can also use it for serial

debugging.

GND - same as the power ground pins

5V - same as the VBUS pin

RX - same as the RX pin

TX - same as the TX pin

RST - there's a 0.1uF capacitors in between this pin and the Reset pin, so that

Arduino-compatible programmers will work correctly with the DTR/RTS-toggle

technique

Industries

https://learn.adafruit.com/introducting-pro-trinket Page 19 of 41