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Цитата из ДС:
R - Read Time. Setting the R bit to 1 copies a static
image of the timekeeping registers and places them in a
holding register. The user can then read them without
concerns over changing values causing system errors.
The R bit going from 0 to 1 causes the timekeeping
capture, so the bit must be returned to 0 prior to
reading again.
Еще посмотрите правильнось завершения чтения -
должен быть NO ACK от мастера.