The header file <inmsp.h> defines a number of intrinsic functions of general use for the MSP430 processor. This file is written to be compatible, and in some cases an enhancement of, the <in430.h> file in version 3 of IAR's Embedded Workbench for MSP430 (EW430) product.

Status register manipulation
__bic_SR_register Clear bits in status register
__bic_SR_register_on_exit Clear bits in stacked status register
__bis_SR_register Set bits in status register
__bis_SR_register_on_exit Set bits in stacked status register
__disable_interrupt Disable global interrupts
__enable_interrupt Enable global interrupts
Byte order manipulation
__swap_long_bytes Swap order of bytes in a long
__swap_words Swap order of words in a long
__swap_bytes Swap order of bytes in a word
__swap_nibbles Swap order of nibbles in a byte
Bit order manipulation
__bit_reverse_char Reverse the order of bits in a char
__bit_reverse_short Reverse the order of bits in a short
__bit_reverse_long Reverse the order of bits in a long
__bit_reverse_long_long Reverse the order of bits in a long long
Bit counting
__bit_count_leading_zeros_char Count the number of leading zero bits in a char
__bit_count_leading_zeros_short Count the number of leading zero bits in a short
__bit_count_leading_zeros_long Count the number of leading zero bits in a long
__bit_count_leading_zeros_long_long Count the number of leading zero bits in a long long
Register manipulation
__get_register Read the value of a CPU register
__set_register Write a CPU register with a given value
Binary coded decimal arithmetic
__bcd_add_short Add two 16-bit values using decimal arithmetic
__bcd_add_long Add two 32-bit values using decimal arithmetic
__bcd_add_long_long Add two 64-bit values using decimal arithmetic
__bcd_negate_short Negate a 16-bit value using decimal arithmetic
__bcd_negate_long Negate a 32-bit value using decimal arithmetic
__bcd_negate_long_long Negate a 64-bit value using decimal arithmetic
__bcd_subtract_short Subtract two 16-bit values using decimal arithmetic
__bcd_subtract_long Subtract two 32-bit values using decimal arithmetic
__bcd_subtract_long_long Subtract two 64-bit values using decimal arithmetic
Miscellaneous functions
__no_operation Insert a NOP instruction
__insert_opcode Insert an instruction
__delay_cycles Delay execution for a number of cycles