ATSHA204(2012) Ver la hoja de datos (PDF) - Atmel Corporation
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componentes Descripción
Fabricante
ATSHA204 Datasheet PDF : 65 Pages
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Byte #
Name
52,54,56,58 UseFlag
60,62,64,66
53,55,57,59 UpdateCount
61,63,65,67
68 83
LastKeyUse
84
UserExtra
85
Selector
86
LockValue
87
LockConfig
Description
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.
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.
128 bits to control limited use for KeyID 15.
Initialized to 0xFF.
See Section 3.3.
1-byte value that can be modified via the UpdateExtra command after the
data zone has been locked.
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.
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.
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.
Write
If config
unlocked
Read
Always
If config Always
unlocked
If config Always
unlocked
Via
update
extra
cmd only
Via
update
extra
cmd only
Via lock
command
only
Always
Always
Always
Via lock Always
command
only
Atmel ATSHA204 [DATASHEET]
6
8740D−CRYPTO−3/12
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