63.9.3.8 Bus Clear Command

The TWI interface can perform a Bus Clear command:

Configure Host mode (DADR, CKDIV, etc).
Read FLEX_TWI_SR.SDA/SCL flags and check the TWD (SDA) and TWCK (SCL) lines hold a high level.
Send the Bus Clear command by setting FLEX_TWI_CR.CLEAR.

Note: When TWD (SDA)=0, the Bus Clear command must be performed via the PIO. When TWCK (SCL)=0, no Bus Clear command can be issued.

Note: If an alternative command is used (ACMEN bit = 1), the DATAL field must be cleared.

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