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-S (1 bit) : Start bit
-P (1 bit) : Stop bit
+S : Start condition
+P : Stop condition
Rd/Wr (1 bit) : Read/Write bit. Rd equals 1, Wr equals 0.
A, NA (1 bit) : Accept and reverse accept bit.
Addr (7 bits): I2C 7 bit address. Note that this can be expanded as usual to