57.9.5.6 Alternative Command

In Client mode, the Alternative Command mode is used when the SMBus mode is enabled to send or check the PEC byte.

The Alternative Command mode is enabled by setting the ACMEN bit of the TWI Control register, and the transfer is configured in FLEX_TWI_ACR.

For a combined transfer with PEC, only the NPEC bit in FLEX_TWI_ACR must be set as the PEC byte is sent once at the end of the frame.

See Client Read/Write Flowcharts for detailed flowcharts.