ATECC508A datasheet(56/109 Pages) MICROCHIP

56 / 109 page

If insufficient bytes are sent to the device when it is in Single-Wire mode, the device automatically

transitions to the low power sleep mode after the tTIMEOUT interval. In I2C mode, the device continues to

wait for the remaining bytes until the watchdog timer limit tWATCHDOG is reached, or a Start/Stop condition

is received by the device.

9.1.2

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 wake and after 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. When the length of that group is four bytes, the codes

returned are detailed in the table below. Some commands return more than four bytes when they execute

successfully. The resulting packet description is listed in the Command section that follows.

CRC errors are always returned before any other type of error. They indicate that some sort of 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 9-3. 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 client 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 ATECC508A. 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.

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 ATECC508A has received a proper Wake token.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 56

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