Microcontrollers have on-board timers that are free running that can be used for various things. It is very useful for executing code that needs to be run at a constant interval.


  1. Configure and set up the timer and the interrupt.
  2. Program the microcontroller to handle the interrupt and execute code (toggle LED).


Timers can be really useful for updating something or feeding in data at a constant interval. This works better than having to constantly check something (polling) in the main code because it would use up too much resources.

I encountered a lot of issues while going through this lab. For one, I was using the wrong target microcontroller because I didn’t realize that the microcontroller that came on the board was completely different from what I thought. The development kit came with two microcontrollers that you can hotswap. This also meant that I was looking at the wrong data sheets when I initially started this lab. I also ran into the issue of not using the proper interrupt vector and clock but that was easily solved by trial and error.


&TA0CTL: Timer control register.

#TASSEL_X: Timer input clock select.

#MC_X: Timer counter mode select.

#ID_X: Timer clock divider select.

#TAIFG: Timer register overflow interrupt flag.