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Flash memory is a widely used, reliable, and flexible nonvolatile memory to store software code and data in a microcontroller. Failing to handle the flash according to data-sheet specifications can result in unreliable operation of the application. This application report explains the physics behind these specifications and also gives recommendations for the correct management of flash memory on MSP430 microcontrollers (MCUs). All examples are based on the flash memory used in the MSP430F1xx, MSP430F2xx, and MSP430F4xx microcontroller families.