SLAZ465Z May   2014  – August 2021 MSP430FR5949

 

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6.19 CS3

CS Module

Category

Functional

Function

Possible PMM overload when increasing SMCLK frequency to higher than MCLK frequency

Description

When switching SMCLK frequency from lower to higher than MCLK frequency, the device can crash and hang until it is restarted by a reset.

Workaround

1.

a. Increase SMCLK to MCLK frequency to ensure they are the same
b. Then, increase SMCLK frequency to target frequency

OR

2.

a. Increase MCLK frequency to the desired SMCLK frequency
b. Then, increase SMCLK to target frequency
c. Then, decrease MCLK back to the original MCLK frequency