ATECC508A datasheet(15/109 Pages) MICROCHIP

15 / 109 page

Byte

Name

Description

Write

Read

52–59 Counter<0>

Monotonic counter that can optionally be connected to keys via the

SlotConfig.LimitedUse bit. Can count to a value of 2,097,151 and

can never be decremented.

If Config

unlocked

Always

60–67 Counter<1>

Second monotonic counter, not connected to any keys.

If Config

unlocked

Always

68–83 LastKeyUse 128 bits to control limited use for KeyID 15. Initialized to 0xFF. See

Section Limited Use Key (Slot 15 only).

If Config

unlocked

Always

UserExtra

One byte value that can be modified via the UpdateExtra

command after the Data zone has been locked.

Via Update

Extra Cmd

only

Always

Selector

Selects which device will remain in active mode after execution of

the Pause command. See Sections , Pause Command and

UpdateExtra Command).

Via Update

Extra Cmd

only

Always

LockValue

Enables the Data and OTP zone polices set in the configuration

zone.

0x55 = unlocked;

0x00 = locked.

On shipment from Microchip, this byte has a value of 0x55

corresponding to the unlocked state. After the Lock command has

been run, this byte will have a value of 0x00. See Section EEPROM

Locking.

When locked, the OTP zone, when in consumption mode, can be

modified only with the Write command, and slots in the data zone

can be modified only if the corresponding WriteConfig field so

indicates.

When unlocked, the Read command is prohibited within these two

zones.

Via Lock

command

only

Always

LockConfig

Controls the ability to modify the Configuration zone.

0x55 = unlocked;

0x00 = locked.

On shipment from Microchip, this byte has a value of 0x55

corresponding to the unlocked state. After the Lock command has

been run, this byte will have a value of 0x00. See Section EEPROM

Locking.

Via Lock

command

only

Always

88–89 SlotLocked

A single bit for each slot. If the bit corresponding to a particular slot

is zero, the contents of the slot cannot be modified under any

circumstances.

See Section Lock Command.

If Config

unlocked, Via

Lock

command

Always

90–91 RFU

Must be zero.

If Config

unlocked

Always

92–95 X509format

Four individual format bytes are associated with the X.509 certificate

formatting of public keys stored within the device. If the value of the

byte associated with a particular public key is zero, then these

formatting restrictions are ignored and that public key can be

If Config

unlocked

Always

ATECC508A

Device Organization

Datasheet Complete

DS20005927A-page 15

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