vbat pin on Xmega128A1

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The XMega "A" manual refers to a VBAT pin for 32-bit real time clock. I cannot find anything in the A1 manual showing what pin number this actually is. I'm specifically interested in the ATXMega128A1.

Any help greatly appreciated.

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I don't see the "Battery Backup System" in A1, A3, or A4 datasheets. I can only assume that these series do not have that subsystem.

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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Thanks for the response. I searched the A1,A3,and A4 manuals also. I was really hoping to use that feature for my design, but still looks like it is going to be an amazing MCU.