ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 56

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ATSHA204

Manufacturer Part Number
ATSHA204
Description
Atmel CryptoAuthentication
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet

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Table 8-37. Input Parameters
Table 8-38. Output parameter
Opcode
Param1
Param2
Data_1
Data_2
Name
Success
Name
Write
Zone
Address
Value
Mac
4 or 32
0 or 32
Size
Size
1
1
2
1
Notes
Upon successful completion, the Atmel ATSHA204 returns a value of zero.
Notes
0x12
Bits 0 and 1: Select among config, OTP or data. See Section 8.1.5.
Bits 2-5: Must be zero.
Bit 6: If one, the input data must be encrypted. Must be zero if data/OTP zones are
Bit 7: If one, 32 bytes will be written; otherwise, four bytes are written.
Address of first word to be written within the zone. See Section 8.1.4.
Information to be written to the zone; may be encrypted.
Message authentication code to validate address and data.
Ignored if zone is unlocked.
locked.
Atmel ATSHA204 [DATASHEET]
8740D−CRYPTO−3/12
56

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