sparkfun Pro Micro User Manual

If the boards are visible, select the option that matches your board. If you
have a Pro Micro, make sure you select the correct operating speed and
voltage! Then head over to the next page where we’ll upload our first
sketch!
Example 1: Blinkies!
The Arduino-standard Blink sketch won’t have any visible effect on the Pro
Micro – there’s no LED on pin 13. In fact, the only LEDs on the board are
the power indicator, and RX/TX blinkies. Unlike other Arduino boards,
though, we can control the RX/TX LEDs in our sketch. So let’s get blinking!
Upload the RX/TX Blinky Sketch
Copy and paste the code below, and upload* it to your Pro Micro.
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sparkfun Pro Micro Specifications

General

Microcontroller	ATmega32U4
Operating Voltage	5V
Input Voltage	5-12V
Digital I/O Pins	12
PWM Channels	5
DC Current per I/O Pin	20 mA
SRAM	2.5 KB
EEPROM	1 KB
Dimensions	1.3 x 0.7 inches
Analog Input Channels	4
Flash Memory	32 KB (ATmega32U4)
Clock Speed	16 MHz