ATECC608A datasheet(28/81 Pages) MICROCHIP

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Command

Opcode Description

Command Category

Read

0x02

Read 4 or 32 bytes from the device, with or without authentication

and encryption.

General Device Commands

SelfTest

0x77

Test the various internal cryptographic computation elements

General Device Commands

Sign

0x41

ECDSA signature calculation.

Asymmetric Cryptography

Command

SHA

0x47

Compute a SHA-256 or HMAC digest for general purpose use by the

system.

General Device Commands

UpdateExtra

0x20

Update bytes 84 or 85 within the Configuration zone after the

Configuration zone is locked.

General Device Commands

Verify

0x45

ECDSA verify calculation.

Asymmetric Cryptography

Command

Write

0x12

Write 4 or 32 bytes to the device, with or without authentication and

encryption.

General Device Commands

5.1

General Device Commands

The following table provides a summary of the general device commands:

Table 5-2. General Device Commands

Command Name Opcode

Description

Counter

0x24

Increments and reads the monotonic counters.

Info

0x30

Used to read revision and status information from the device.

Lock

0x17

Used to lock the individual lockable slots in the device.

Nonce

0x16

Used to generate or pass a number used once into the device.

Random

0x1B

Used to generate a 32-byte random number used by the system.

Read

0x02

Used to read various zones of the device.

SelfTest

0x77

Tests the various internal cryptographic computation elements.

SHA

0x47

Computes a SHA-256 or HMAC digest for general purpose use by the system.

UpdateExtra

0x20

Updates bytes 84 or 85 within the Configuration zone after the Configuration zone is

locked.

Write

0x12

Used to write 4 or 32 bytes to the device, with or without authentication and

encryption.

5.1.1

Counter Command

The Counter command reads the binary count value from one of the two monotonic counters located on the device

within the Configuration zone. The maximum value that the counter may have is 2,097,151. Any attempt to count

beyond this value will result in an error code. The counter is designed to never lose counts even if the power is

interrupted during the counting operation. In some power loss conditions, the counter may increment by a value of

more than one.

For the ATECC608A-TNGLoRaWAN, the counters are not attached to any keys but may still be used by the system.

Each count is set to its default value and can count to the maximum value.

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

DS40002154B-page 28

ATECC608A Datasheet(PDF) 28 Page - Microchip Technology

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