Description: This is a breakout board for the 100-pin TQFP package of Atmel’s ATxmega128A1. The ATxmega128A1 is a low power, high performance and peripheral rich CMOS 8/16-bit microcontroller based on the AVR enhanced RISC architecture.
Among the chip’s many features are 128kB of flash memory, 8 kB SRAM, 78 I/O pins, eight 16-bit timers, sixteen 12-bit ADCs, four 12-bit DACs, eight USART, four SPI and four TWI interfaces. This powerful chip can process up to 32 MIPS when running at its maximum clock speed of 32MHz. The operating voltage of the xmega is 1.6 to 3.6VDC.
All VCC pins of the ATxmega128A1 are connected together and brought out to a single header pin, same goes for the GND and AVCC pins of the chip. We’ve also included decoupling capacitors, and a red power indicator LED; but beyond those we’ve tried to keep the board as simple and straightforward as possible. If you want to start developing with this chip, but don’t want to deal with soldering it, this is the board for you!
Note: The 6 pins labeled ICSP are used to program the board through the PDI interface using the common 6 pin ICSP cable found on most AVR programmers. Also, this board ships with the example code shown below and the JTAGEN bit set to 1 (JTAG disabled, PDI enabled).
Note: We have found that when using a Dragon device, you must use the JTAG interface, you can not program/debug over PDI. If you are using the JTAGICE3 you can use either JTAG or PDI however, you will need to change the PDI clock to run at 1 MHz or slower.
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This is the I/O land of milk and honey. No shortage of serial ports or I/O pins! I do have two suggestions: Add a 16MHz crystal, or even just the mounting holes for one (even though it will run out-of-the-box with the 2MHz RC oscillator built in). Also, bring the programming port out with enough room around it to put in a shrouded connector. You have to leave 4 pins next to the programming port empty in order for the mkII ISP connector to fit. The pins next to the ISP port are for crystals.