47.9.1 Transfer Format

The data put on the TWD line must be 8 bits long. Data are transferred MSB first; each byte must be followed by an acknowledgement. The number of bytes per transfer is unlimited (see figure below).

Figure 47-84. Transfer Format

Each transfer begins with a START condition and terminates with a STOP condition (see figure below).

  • A high-to-low transition on the TWD line while TWCK is high defines the START condition.
  • A low-to-high transition on the TWD line while TWCK is high defines a STOP condition.
Figure 47-85. START and STOP Conditions