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LPC1837 Backup Registers

The processor has 64 registers (256 bytes) in the RTC power domain

I am using these registers to store temporary data which then gets committed to flash at the end of a transaction.

I can read / write data ok but am getting some odd reads at times.

The Datasheet has specific timings for for writing to the RTC registers..

Do these timings also apply to the Backup Registers as there in the RTC power domain?

Thanks in advance.

Jon.