Hi Gangaram, Please refer to the datasheet for the MSP430F6749 found here for more information on the pinout: www.ti.com/.../msp430f6749.pdf Pins 19 and 20 are VASYS2 and VASYS1 respectively. They can be connected to AVCC and must be connected externally on board for proper device operation. That is footnote (3) on the bottom of page 17. Pin 9 is AVCC. Pins 21, 22, and 29 are AUXVCC2, AUXVCC1, and AUXVCC3 respectively. These are auxiliary power supplies for the system. Pins 23 and 75 are VDSYS1 and VDSYS2 respectively. They can be connected to DVCC and must be connected externally on board for proper device operation. That is footnote (3) on the bottom of page 21. Pin 24 is DVCC. Regards, Akash Patel
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