ATSGA204A View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'ATSGA204A' PDF : 93 Pages View PDF
ATSHA204A
Device Organization
2.1.2.5
Selector Mode
If 0x00, then the Selector is updated with UpdateExtra.
All other values can only allow the Selector to be updated if its value is zero.
2.1.2.6 Slot Config
See Table SlotConfig Bits (Per Slot).
2.1.2.7
UseFlag
For uses with “limited-use slots”. The quantity of “1” bits represents the number of times that slots 0 thru 7
may be used before being disabled.
2.1.2.8 UpdateCount
Indicates how many times slots 0 through 7 have been updated with DeriveKey.
2.1.2.9
LastKeyUse
Used to control limited use for Slot 15. Each “1” bit represents a remaining use for Slot 15. Applies only if
SlotConfig<5> LimitedUse is set.
2.1.2.10 UserExtra
For general system use, can be modified through the UpdateExtra command.
2.1.2.11 Selector
Selects which device remains in active mode after the execution of the Pause command.
2.1.2.12 LockValue
Controls the Data and OTP zones are unlocked and can be freely written but not read.
0x55 = The Data and OTP zones are unlocked and has write access.
0x00 = The Data and OTP zones are locked and take on the access policies defined in the configuration
zone. Slots in the Data zone can only be modified based on the corresponding WriteConfig fields. The
OTP zone can only be modified based on the OTP mode.
2.1.2.13 LockConfig
Configuration zone access.
0x55 = The Configuration zone has write access (unlocked).
0x00 = The Configuration zone does not have write access (locked).
2.1.2.14 SlotConfig (Bytes 20 – 51)
The 16 SlotConfig elements configure the access protections for each of the 16 slots within the
ATSHA204A. Each configuration element consists of 16 bits, which control the usage and access for that
particular slot or key. The SlotConfig field is interpreted according to the table below when the Data zone
is locked. When the Data zone is unlocked, these restrictions do not apply and all slots may be freely
written and none may be read.
Table 2-5. SlotConfig Bits (Per Slot)
Bit Name
15-12 WriteConfig
11-8 WriteKey
Description
See detailed function definition for use.
Slot of the key to be used to validate encrypted writes.
© 2018 Microchip Technology Inc.
DS40002025A-page 12
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