MSP430 C语言的关键字扩展

Intrinsic functions summary To use intrinsic functions in an application, include the header file intrinsics.h.
Note that the intrinsic function names start with double underscores, for example:
__disable_interrupt
The following table summarizes the intrinsic functions:

Intrinsic function	Description
__bcd_add_type	Performs a binary coded decimal operation
__bic_SR_register	Clears bits in the SR register
__bic_SR_register_on_exit	Clears bits in the SR register when an interrupt or monitor function returns
__bis_SR_register	Sets bits in the SR register
__bis_SR_register_on_exit	Sets bits in the SR register when an interrupt or monitor function returns
__data16_read_addr	Reads data to a 20-bit SFR register
__data16_write_addr	Writes data to a 20-bit SFR register
__data20_read_type	Reads data which has a 20-bit address
__data20_write_type	Writes data which has a 20-bit address
__delay_cycles	Provides cycle accurate code size minimized delay functionality
__disable_interrupt	Disables interrupts
__enable_interrupt	Enables interrupts
__even_in_range	Makes switch statements rely on the specified value being even and within the specified range
__get_interrupt_state	Returns the interrupt state
__get_R4_register	Returns the value of the R4 register
__get_R5_register	Returns the value of the R5 register
__get_SP_register	Returns the value of the stack pointer
__get_SR_register	Returns the value of the SR register
__get_SR_register_on_exit	Returns the value that the processor status register will have when the current interrupt or monitor function returns
__low_power_mode_n	Enters a MSP430 low power mode
__low_power_mode_off_on_exit	Turns off low power mode when a monitor or interrupt function returns
__no_operation	Inserts a NOP instruction
__op_code	Inserts a constant into the instruction stream
__set_interrupt_state	Restores the interrupt state
__set_R4_register	Writes a specific value to the R4 register
__set_R5_register	Writes a specific value to the R5 register
__set_SP_register	Writes a specific value to the SP register
__swap_bytes	Executes the SWPB instruction