HW - Hello World

This is a very simple project designed only to familiarize oneself
with the use of a Makefile, the compiler, linker, and FLASH download
tool (such as AVRDUDE) when working with the MAVRIC / MAVRIC-II board.

This program simply blinks the on-board LED on and off, once per
second.  It demonstrates setting up a periodic timer interrupt as a
time keeping source, declaring and using an interrupt handler with
AVR-GCC, and toggling a PORT output line on and off.

See: http://www.bdmicro.com/

Configuration:

  * If using a MAVRIC: ensure that DIPSW 9 is "on".

  * If using a MAVRIC-II: ensure that jumper LEDEN is installed