10-bit Client Addressing

For a client address higher than seven bits, the user must configure the address size (IADRSZ) and set the other client address bits in the Internal Address register (FLEX_TWI_IADR). The two remaining internal address bytes, IADR[15:8] and IADR[23:16], can be used the same way as in 7-bit client addressing.

Example: Address a 10-bit device (10-bit device address is b1 b2 b3 b4 b5 b6 b7 b8 b9 b10)

  1. Program IADRSZ = 1.
  2. Program DADR with 1 1 1 1 0 b1 b2 (b1 is the MSB of the 10-bit address, b2, etc.).
  3. Program FLEX_TWI_IADR with b3 b4 b5 b6 b7 b8 b9 b10 (b10 is the LSB of the 10-bit address).

The following figure shows a byte write to a TWI EEPROM. This demonstrates the use of internal addresses to access the device.

Figure 9-104. Internal Address Usage