3 TXE81XX 24-Bit SPI Word Definition

TXE81XX uses the following 24-bit word structure to initiate SPI writes and reads to and from the device.

The SPI word is 24 bits long and requires data to be shifted in MSB first on SDI.

B23 → R/W = read or write bit (R = 1, W = 0)

B22 - B21 = (X) don’t care

B20 - B16 = feature address (5 bits)

B15 = (X) do not care

B14 - B12 = port selection (Port 0 = 000, Port 1 = 001, Port 2 = 010)

B11 - B9 = (X) don’t care

B8 = multi-port bit (multi-port enabled = 1, multi-port disabled = 0)

B7 - B0 = data byte