Data Sheet

The AStar32U4PrimeLCD library provides functions to display data on a connected LCD. It is designed to gracefully

handle alternate use of the LCD data lines by only changing pin states when needed for an LCD command, after

which it will restore them to their previous states. This allows the LCD data lines to be used for other functions (such

as pushbutton inputs and LED drivers).

Other connectors

The A-Star 32U4 includes a USB Micro-B connector that can be used to connect to a computer’s USB port via a USB

A to Micro-B cable [http://www.pololu.com/product/2072] (not included). The USB connection can be used to transmit

and receive data from the computer, and a preloaded USB bootloader makes it possible to program the board over

USB. The USB connection can also provide power to the A-Star.

The board also has a 6-pin ISP header that allows it to be programmed with an external programmer, such as our

USB AVR programmer [http://www.pololu.com/product/1300]. Pin 1 of the header is indicated with a small dot and has an

octagonal shape. Three of the pins on this header can be used as an SPI interface or as general-purpose digital I/O, as

labeled on the back side of the board and shown in the pinout diagram. In the Arduino environment, you can refer to

these three pins using either their pin numbers or the names of their SPI functions (which are defined as aliases); for

5. A-Star 32U4 Prime Page 24 of 47