ATSHA204 datasheet(6/65 Pages) ATMEL

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Atmel ATSHA204 [DATASHEET]

8740D

−CRYPTO−3/12

Byte #

Name

Description

Write

Read

52,54,56,58

60,62,64,66

UseFlag

For “single use” keys (Section 3.3), this byte indicates how many times a key

may be used before such use is disabled. Applies to keys #0-7 only (byte 52

corresponds to Key0, 54 to Key1, and so on). Initialized to 0xFF.

See Section 3.3.

If config

unlocked

Always

53,55,57,59

61,63,65,67

UpdateCount

For keys that can be updated with DeriveKey, these bytes indicate how many

times this operation has been performed. Applies to keys #0-7 only, (byte 53

corresponds to Key0, 55 to Key1, and so on).

Initialized to 0x00.

See Sections 3.3 and 8.2.

If config

unlocked

Always

 83

LastKeyUse

128 bits to control limited use for KeyID 15.

Initialized to 0xFF.

See Section 3.3.

If config

unlocked

Always

UserExtra

1-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 the execution of the

pause command.

See Sections 8.10 and 8.13 for more details.

Via

update

extra

cmd only

Always

LockValue

Controls the ability to write the OTP and data zones.

0x55 = unlocked

0x00 = locked

On shipment from Atmel, 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, corresponding to “locked.” See Sections 2.1.2 and 8.7 for more

details.

When locked, the OTP zone 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 Atmel 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, corresponding to”locked.”

See Sections 2.1.2 and 8.7 for more details.

Via lock

command

only

Always

ATSHA204 Datasheet(PDF) 6 Page - ATMEL Corporation

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