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TMP101: TMP101 Register

Part Number: TMP101

According to datasheet, TMP101 has 5 registers, which are Pointer Register, Temperature Register and Configuration

Register, TLOWRegister and THIGHRegister.The Pointer Register is configured to identify which Register to read and write to, as shown in the following figure:

How do I access the Pointer Register to read and write?There seems to be no explanation in the documentation.any  advice? thanks in advance