ATECC608A datasheet(21/81 Pages) MICROCHIP

21 / 81 page

4.3

Status/Error Codes

The device does not have a dedicated STATUS register, so the output FIFO is shared among status, error, and

command results. All outputs from the device are returned to the system as complete groups which are formatted

identically to input groups:

• Count

• Packet

• Two byte CRC

After the device receives the first byte of an input command group, the system cannot read anything from the device

until the system has sent all the bytes to the device.

After the wake and execution of a command, there will be error, status, or result bytes in the device’s output register

that can be retrieved by the system. For a four bytes length of that group, the codes returned are detailed in Table

4-3. Some commands return more than four bytes when they execute successfully. The resulting packet description

is listed in Section 5. Device Commands .

CRC errors are always returned before any other type of error. They indicate that an I/O error occurred, and that the

command may be resent to the device. No particular precedence is enforced among the remaining errors if more

than one occurs.

Table 4-3. Status/Error Codes in Four Byte Groups

State Description

Error/

Status

Description

Successful Command

Execution

0x00

Command executed successfully.

Checkmac or Verify

Miscompare

0x01

The CheckMac or Verify command was properly sent to the device, but the input

response did not match the expected value.

Parse error

0x03

Command was properly received but the length, command opcode, or parameters

are illegal regardless of the state (volatile and/or EEPROM configuration) of the

ATECC608A-TNGLoRaWAN. Changes in the value of the command bits must be

made before it is re-attempted.

ECC Fault

0x05

A computation error occurred during ECC processing that caused the result to be

invalid. Retrying the command may result in a successful execution.

Self Test error

0x07

There was a Self Test error and the chip is in Failure mode waiting for the failure to

be cleared.

Health Test error

0x08

There was a random number generator Health Test error and the chip fails

subsequent commands requiring a random number until it is cleared.

Execution error

0x0F

Command was properly received but could not be executed by the device in its

current state. Changes in the device state or the value of the command bits must be

made before it is re-attempted.

After Wake,

Prior to First command

0x11

Indication that ATECC608A-TNGLoRaWAN has received a proper Wake token.

Watchdog About to Expire

0xEE

There is insufficient time to execute the given command before the Watchdog Timer

expires. The system must reset the Watchdog Timer by entering the Idle or Sleep

modes.

CRC or Other

Communications error

0xFF

Command was not properly received by ATECC608A-TNGLoRaWAN and should be

retransmitted by the I/O driver in the system. No attempt was made to parse or

execute the command.

ATECC608A-TNGLoRaWAN

General Command Information

Complete Datasheet

DS40002154B-page 21

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