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MSP430F249-EP: When power on, AVCC pin get grounded

Part Number: MSP430F249-EP


I have my own development board, where i got an issue like, whenever i power ON my IC AVCC pin get shorted by showing some impedence (ohm) value. After i powered OFF, the impedence value gradually raises and short gone. Whether it causes any damage to IC or board during programming, what causes this issue? Please give some solutions.