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
Binary coded decimal arithmetic
_DADD16, _DADD32, _DADD64, _DNEG16, _DNEG32, _DNEG64, _DSUB16, _DSUB32, _DSUB64,
Miscellaneous functions
_NOP, _OPC