57.9.5.5.1 Read/Write Operation

A TWI high-speed frame always begins with the following sequence:

START condition (S)
Host Code (0000 1XXX)
Not-acknowledge (NACK)

When the TWI is programmed in Client mode and TWI High-speed mode is activated, host code matching is activated and internal timings are set to match the TWI High-speed mode requirements.

Figure 57-132. High-Speed Mode Read/Write

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