The first four fields (X/Y/wafer/lot) together are guaranteed to be unique. On the MSP430, all these values have 16 bits, and I doubt that the X/Y values can cover the full 16-bit range. How many bits do you need, or can you use? On USB devices, the die record is used to create the USB serial number, which also must be unique. TI's USB stack just uses hex dump of the raw bytes after calling TLV_getInfo(); there is no better function.
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