I have a general question about the handling of interrupts in microcontrollers. I am using the MSP430, but I think the question may be extended to other uCs. I would like to know whether is or not a good practice to enable/disable interrupts frequently along the code. I mean, if I have a portion of code that is not going to be sensitive to interrupts (or even worse, must not listen to interrupts, for any reason), is it better to:

• Disable the interrupts before and then re-enable them after the critical section.
• Put a flag inside the respective ISR and (instead of disabling the interrupt), set the flag to false before the critical section and resetting it to true, just after. To prevent the code of the ISR from being executed.
• Neither of the two, so suggestions are welcome!