the header with definitions of registers are in /usr/include/msp/msp430x2xxx.h debug step-by-step in http://karuppuswamy.com/wordpress/2010/10/14/setup-build-and-debug-environment-for-msp430-mcus-using-mspgcc-and-mspdebug-in-ubuntu-linux/ TODO put the step to step to debug aplications here