4.2 Command Packets

The command packet is broken down as shown in Table 4-2:

Table 4-2. Command Packets
ByteNameMeaning
0OpcodeThe command code. See Section Device Commands .
1Param1The first parameter; always present.
2 – 3Param2The second parameter; always present.
0 – 155DataOptional remaining input data.

After the ATECC608A-TNGLoRaWAN 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.