The header file <in430.h> defines a number of intrinsic functions of general use for the MSP430 processor.

Status register manipulation

_BIC_SR, _BIC_SR_IRQ, _BIS_SR, _BIS_SR_IRQ, _DINT, _EINT

Byte order swapping

_LSWPB, _LSWPW, _SWPB

Miscellaneous functions

_NOP, _OPC