ATSHA204A データシートの表示（PDF） - Atmel Corporation
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ATSHA204A Datasheet PDF : 82 Pages
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2.1.2.1 I2C Enable
Bit 0:
If zero, it is a Single-Wire Interface.
If one, it is an I2C interface.
Bit 1–7: Ignored and set by Atmel.
2.1.2.2 I2C Address
I2C
Bit 0:
Ignored.
Bits 1 – 7: I2C device address
Single-Wire
Bits 0 – 2:
Bit 3:
Bits 4 – 7:
Ignored.
TTL Enable
If zero, then the input level uses a fixed reference.
If one, then the input level uses the VCC reference.
Ignored.
2.1.2.3 CheckMacConfig
This byte applies only to the CheckMac, Read, and Write commands:
Read and Write
Bit 0 controls Slots 0 and 1, bit 1 controls Slots 2 and 3, and so on. Any encrypted Read/Write command
will fail if the value in TempKey.SourceFlag does not match the corresponding bit in this byte. This byte is
ignored for clear text reads and writes.
CheckMac
Bit 0 controls slot 1, bit 1 controls Slot 3 and so on. The copy function will only be enabled if the
CheckMacSource value corresponding to the target slot matches the value of Mode bit 2 of the CheckMac
command. The command will fail if Mode bit 2 does not match TempKey.SourceFlag, so this is equivalent
to requiring the corresponding bit in this byte to match TempKey.SourceFlag.
2.1.2.4 OTP Mode
0xAA (Read-only mode) = When OTP zone is locked, writes are disabled and reads of all words are permitted.
0x55 (Consumption mode) = Writes to the OTP zone when the OTP zone is locked will causes the bits to
transition only from a one to a zero. Reads of all words are permitted.
0x00 (Legacy mode) = When OTP zone is locked, writes are disabled, reads of Words 0 and 1, and 32-byte
reads are disabled.
All other modes are reserved.
2.1.2.5 Selector Mode
If zero, then the Selector will be updated with UpdateExtra.
All other values will only allow the Selector to be updated if it's value is zero.
2.1.2.6 Slot Config
See Table 2-3, SlotConfig Bits (Per Slot).
2.1.2.7 Use Flag
For uses with “single-use slots”. The quantity of “1” bits represents the number of times that slots 0 thru 7 may
be used before being disabled.
ATSHA204A [DATASHEET] 11
Atmel-8885H-CryptoAuth-ATSHA204A-Datasheet_112015
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