17.8 Enabling/Disabling Interrupts
The built-in functions __builtin_get_isr_state and
__builtin_set_isr_state can be used to check and set the Interrupt
Priority Level and Interrupt Enable bits. The
__builtin_disable_interrupts and
__builtin_enable_interrupts built-in functions can be used to
disable and enable interrupts. See Built-In Function Descriptions for a description
of these built-in functions.