Operating Modes (Reset → Active)
BOR → POR → PUC → Active (AM)
As shown below, BOR is the first of three reset states.
BOR → POR → PUC → Active (AM)
Three Levels of Reset
BOR is most comprehensive, followed by:
POR = Power-On Reset
PUC = Power-Up Clear
Different events trigger different resets; e.g.
SVS (power supervisor) triggers POR
WDT (watchdog) triggers PUC
Each level touches different bits in CPU and
peripheral registers → User Guide notation:
Different reset states, such as BOR, POR and PUC are triggered from different events. For
example, upon power-up you may want to do a full system reset; though, this is usually not
desired for something like a watchdog timeout event.
The previous page contained a list of actions that occur in the MSP430 hardware when a BOR
event occurs. To find these details for all of the reset modes, please refer to the datasheet and
users guides; as shown above, there are different nomenclature which represent the reset mode
where a given hardware default value is applied.
4 - 4 MSP430 Workshop - MSP430 Clocks & Initialization
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