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:
  1. 1.It acts as the enabling character for the UPDI after a disable.
  2. 2.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.