8.3.9.3.11 TWI High-Speed Host
TWI High-Speed Host mode is enabled when FLEX_TWI_CR.HSEN=1 and FLEX_TWI_CR.MSEN=1. TWI
High-Speed mode operation is similar to TWI operation, with the following exceptions:
- A host code is sent first at normal speed before enabling TWI High-Speed mode.
- Arbitration is only possible during host code transmission.
- When TWI High-Speed mode is active, an internal mechanism is enabled to shorten the SCL signal rise time
- When TWI High-Speed mode is active, clock stretching is only allowed after acknowledge (ACK), not-acknowledge (NACK), START (S) or repeated START (Sr) (as a consequence, overflow can happen).
- When TWI High-Speed mode is active, the data transfer uses the TWI High Speed mode bit rate which can be defined in FLEX_TWI_HSCWGR.
TWI High-Speed mode allows transfers up to 3.4 Mbits/s.