28.5.5 10-bit Addressing with Address or Data Hold
Reception using 10-bit addressing with AHEN or DHEN set is the same as with 7-bit modes. The only difference is the need to update the SSPxADD register using the UA bit. All functionality, specifically when the CKP bit is cleared and SCL line is held low are the same. Figure 28-21 can be used as a reference of a slave in 10-bit addressing with AHEN set.
Figure 28-22 shows a standard waveform for a slave transmitter in 10-bit Addressing mode.