ATECC508A datasheet(92/109 Pages) MICROCHIP

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match that in SlotConfig.WriteKey. Prior to data locking, any key can be used to generate TempKey and

the GenDigData bit is ignored.

The KeyConfig.ReqRandom, KeyConfig.ReqAuth and KeyConfig.AuthKey are ignored by this command

because they will have been checked by the GenDig command for the parent encrypting key.

When performing an encrypted Write to a partial block at the end of slots 0 through 7 and 9 through 15,

all 32 bytes of input must be sent to the device, with the unused bits being used only as part of the MAC

calculation. Their value will not affect the final contents of the EEPROM.

Table 9-56. Input Parameters

Name

Size

Notes

Opcode

Write

0x12

Param1

Zone

Bit 7:

0 = 4 bytes will be written.

1 = 32 bytes will be written.

Bit 6:

0 = The input data is in the clear.

1 = The input data has been encrypted.

This bit is ignored after the Data zone is locked.

Bits 5–2:

Must be zero.

Bits 1–0:

Select among Config, OTP or Data. See Section Zone Encoding.

Param2 Address

Address of first word to be written within the zone.

See Section Address Encoding.

Data_1

Value

4 or 32 Information to be written to the zone. May be encrypted.

Data_2

MAC

0 or 32 Message authentication code to validate address and data.

Table 9-57. Output Parameter

Name

Size

Notes

Success

Upon successful completion, ATECC508A returns a value of zero.

ATECC508A

Security Commands

Datasheet Complete

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