ATECC508A datasheet(73/109 Pages) MICROCHIP

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9.9

Info Command

Info command accesses some static or dynamic four byte information from the device depending upon

the value of mode. Illegal values of the mode parameter will result in a parse error response.

Table 9-26. Mode Encoding

Param1

Mode

Notes

0x00

Revision A single 4-byte word representing the revision number of the device is returned. Software

should not depend on this value as it may change from time to time.

At the time of data sheet creation the Info command will return 0x00 0x00 0x50 0x00. For

all versions of the ECC508A the 3rd byte will always be 0x50. The fourth byte will indicate the

silicon revision.

0x01

KeyValid Returns a value of one if an ECC private or public key stored in the key slot specified by param

is valid and zero if the key is not valid. For public keys in slots where PubInfo is zero, the

information returned by this command is not useful. This information is not meaningful for slots

in which KeyType does not indicate a supported ECC curve.

0x02

State

Returns various dynamic state information as follows:

First byte on the bus:

Bit 7:

TempKey.NoMacFlag

Bit 6:

TempKey.GenKeyData

Bit 5:

TempKey.GenDigData

Bit 4:

TempKey.SourceFlag

Bits 3–0:

TempKey.KeyID

Second byte on the bus:

Bit 7:

TempKey.Valid

Bits 6–3:

AuthKeyID: The slot ID on which an authorization was performed

Bit 2:

AuthValid: A valid authorization sequence has been performed

Bit 1:

SRAM RNG: Seed has been updated this power cycle

Bit 0:

EEPROM RNG: Seed has been updated this power cycle

The third and fourth bytes on the bus are all zeros.

0x03

GPIO

Accesses the GPIO pin when the device is in either of the Single-Wire Interface modes. The

specific operation is controlled by Param2 as follows:

Bits 15-2:

Must be zero

Bit 1:

Driver state; Input (0) or Output (1)

Bit 0:

State to which output is to be driven.

Ignored if bit 1 is zero

Always return the current state in the first byte followed by three bytes of 0x00.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 73

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