6.7.5 Other Interrupt Information

An interrupt routine can perform any task performed by any other function, including accessing global variables, allocating local variables, and calling other functions.

When you write interrupt routines, keep the following points in mind:

• It is your responsibility to handle any special masking of interrupts.
• A C/C++ interrupt routine cannot be called directly from C/C++ code. You need to arrange for an interrupt signal to happen.
• In a system reset interrupt, such as _c_int00, you cannot assume that the run-time environment is set up; therefore, you cannot allocate local variables, and you cannot save any information on the run-time stack.