35.3.1.3 SYNCH Character
The SYNCH character has eight bits and follows the regular UPDI frame format. It has a
fixed value of
0x55. The SYNCH character has two main purposes:- It acts as the enabling character for the UPDI after a disable.
- It is used by the Baud Rate Generator to set the baud rate for the subsequent transmission. If an invalid SYNCH character is sent, the next transmission will not be sampled correctly.