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