1146bade70
PCF8563's second/minute/hour/day/weekday/month/year registers are contiguous (0x02-0x08), so PCF8563_ReadDateTime() bursts all 7 bytes in one transaction. PCF8563_ReadTime() becomes a thin wrapper that discards the date fields. WriteTime() is kept as its own 3-byte-only implementation (writing only sec/min/hour) rather than routed through the new WriteDateTime(), since forcing it through a 7-byte write would require synthesizing date values and risk corrupting the stored date; WriteDateTime() is added as a separate full 7-byte write for callers that actually have real date+weekday values to persist.