Part Number: MSP430F5342
We have been using the MSP430F5342 in our application. I am going to use it to wake up the new device. Essentially, it will be powered all the time and will monitor an accelerometer for motion. If it detects any, it will receive an interrupt and enable the other power supplies on the board.
My question is how do I clock it and remain in the low power mode?
According to a table in the datasheet (shown below), if I run it at 1MHz from RAM, I can reduce its current draw to 0.2mA. Running the processor at 1MHz is fine for me application.
How do I do this at these current levels?
Do I use a crystal or the internal FLL?
How do you use the internal FLL?
If I wanted to revert to using an external clock if it was available, how would I accomplish this?
There will be a 12.288MHz clock once the power supplies are enabled. The corollary to this is that the clock will go away once we go back into low power mode so it would need to revert to 1MHz. It is fine if we simply stay at 1MHz, but we may have more features that we could use if we could speed it up during operation.
