MSP430 UART Question

Hello All,

New to MSP430 world and have a couple of questions…

  1. With a controller such as the MSP430F2121, if I wanted to implement a 56kBPs software UART, do I have to have a crystal or can I just depend on the DCO?

  2. If I use a part such as a MSP430F1222 which has a hardware UART, do I still have to have a crystal?

  3. In either case, would a 32.768Khz crystal suffice if a crystal is necessary?

Thanks in Advance :slight_smile:

Nirosh

It should be OK. TI has a UART example that they claim works at 115,200 with the DCO.

Leon

The DCO of F2xx has small temperature coefficient and calibrated register settings (stored in info Flash). You can get 2% accuracy and should be okay for most UART on the other side.

I think it is more difficult for F1xx to get accurate clock. You will have to depend on the cooperation of the device on the other side to help you if you do not have a crystal for reference.

Thanks for the Assistance on this topic! :slight_smile:

Hi!

On the topic of temperature coefficients…where can I find this information?

I am thinking of changing from the F1222 to the F4250.

Thanks

Nirosh