33.3.3 UPDI Instruction Set

Communication through the UPDI is based on a small instruction set. The instructions are used to access the internal UPDI and ASI Control and Status (CS) space, as well as the memory mapped system space. All instructions are byte instructions and must be preceded by a SYNCH character to determine the baud rate for the communication. See 33.3.1.1 UPDI UART for information about setting the baud rate for the transmission. The following figure gives an overview of the UPDI instruction set.