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Writing MSP430 C Code

MSP430 Compiler Intrinsic Functions

Along with the symbols defined in the device specific header & linker files, it’s common to see

programmers use the compiler’s intrinsic functions. Think of these as functions that are “built-in”

to the TI compiler. In most cases, intrinsic functions correlate to hardware specific features found

in processors.

Intrinsics for MSP430 C Compiler

_bcd_add_short(); _disable_interrupt(); _never_executed();

_bcd_add_long(); _enable_interrupt(); _no_operation();

_bic_SR_register(); _even_in_range(); _op_code();

_bic_SR_register_on_exit(); _get_interrupt_state();

set_interrupt_state();

_bis_SR_register(); _get_R4_register(); _set_R4_register();

_bis_SR_register_on_exit(); _get_R5_register(); _set_R5_register();

_data16_read_addr(); _get_SP_register(); _set_SP_register();

_data16_write_addr (); _get_SR_register(); _swap_bytes();

_data20_read_char(); _get_SR_register_on_exit();

_data20_read_long(); _low_power_mode_0();

_data20_read_short(); _low_power_mode_1();

_data20_write_char(); _low_power_mode_2();

_data20_write_long(); _low_power_mode_3();

_data20_write_short(); _low_power_mode_4();

_delay_cycles();

_low_power_mode_off_on_exit();

 Compiler intrinsic functions are essentially “built-in” C functions

 They usually provide access to underlying hardware features of a processor;

often mapping closely to specific asm instructions

 We will use some of these in today’s workshop:

We’ve circled some of the intrinsic functions we’ll use in this class. From setting and/or clearing

bits in the Status Register (SR) to putting the processor into low-power modes.

2 - 26 MSP430 Workshop - Programming C with CCS

Texas Instruments MSP430 Student Guide

Other manuals for Texas Instruments MSP430