Command Packets

The command packet is broken down as shown in Table 1:

Table 1. Command Packets
Byte	Name	Meaning
0	Opcode	The command code. See Section Device Commands.
1	Param1	The first parameter; always present.
2 – 3	Param2	The second parameter; always present.
0 – 155	Data	Optional remaining input data.

After the ATECC608A-TFLXTLS receives all the bytes in a group, the device transitions to the Busy state and attempts to execute the command. Neither status nor results can be read from the device when it is busy. During this time, the I/O interface of the device ignores all transitions on the I²C SDA input signal.