ATSHA204A datasheet(12/93 Pages) MICROCHIP

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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

Description

15-12 WriteConfig

See detailed function definition for use.

11-8 WriteKey

Slot of the key to be used to validate encrypted writes.

ATSHA204A

Device Organization

DS40002025A-page 12

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