ATSGA204A データシートの表示（PDF） - Microchip Technology
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ATSGA204A Datasheet PDF : 93 Pages
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Bit 0:
0 = Single-Wire Interface Mode.
1= I2C interface Mode.
2.1.2.2 I2C_Address
I2C Mode I2C_Enable<0> = 1
Bits 7 – 1:
I2C device address
Bit 3:
Bit 0:
TTL Enable (Dual purpose bit)
Part of I2C Address and set’s the threshold level.
0= Input level uses a fixed reference.
1 = Input level uses the VCC as reference.
Ignored.
Single-Wire Mode I2C_Enable<0> = 0
Bits 7–4:
Bit 3:
Bits 2–0:
Ignored.
TTL Enable
0= Input level uses a fixed reference.
1 = Input level uses the VCC as reference.
Ignored.
ATSHA204A
Device Organization
2.1.2.3 CheckMacConfig
This byte applies only to the CheckMac, Read and Write commands:
• Read and Write: CheckMacConfig<0> controls Slots 0 and 1, CheckMacConfig<1> controls Slots
2 and 3 and so on. Any encrypted Read or Write command fails 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: CheckMacConfig<0> controls slot 1, CheckMacConfig<1> controls Slot 3 and so on.
The copy function can 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 fails 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 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.
© 2018 Microchip Technology Inc.
DS40002025A-page 11
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