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MSP430FR2433: What's dual-edge mode have to do with BAKMEM registers?

Part Number: MSP430FR2433

On page 310 of the FR2xx and FR4xx user guide (slau445I) is the table for the BAKMEM registers. The footnote says "Both bit 15 and bit 14 must be asserted for dual-edge mode." What has this got to do with these backup memory registers?

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