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Decrements the HH register.
The behaviour depends on whether the last RTCRead was a time/event read or the date. If it was a time or event, the register decrements up to 0 then rolls under to 23. If the last read was the date, it decrements to 0 then rolls under to 99.
RTC documentation and tutorial
Dialect exclusions: Not available in dialects before 16.
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