ATECC508A datasheet(74/109 Pages) MICROCHIP

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Table 9-27. Input Parameters

Name

Size

Notes

Opcode

INFO

0x30

Param1

Mode

See Table 9-26.

Param2

Param

Use depends on mode.

Data

—

Ignored.

Table 9-28. Output Parameters

Name

Size

Notes

Response

The information specified by mode or an error code.

Further information on the GPIO mode is as follows:

•

If the GPIO_Mode field within Config.I2C_Address is set to disabled, or if Config.I2C_Enable<0> is

set to I2C mode, then the GPIO mode always returns an error code to the system firmware.

•

If the GPIO_Mode field within Config.I2C_Address is set to Authorization modes, then the operation

depends on I2C_Address<3>. If this bit is zero, then the device is in Authorization Output mode. If

one, then the device is in Intrusion Detection mode.

–

Authorization Output Mode:

Regardless of the state of Param2<1>, on a successful execution the Info command returns

the current state of the output pin. If Param2<1> indicates output and Param2<0> matches

the default output state (I2C_Address<2>), then set the output to the default; otherwise, if

AuthValid is one and AuthKeyID matches SignalKey, then set the output to the opposite of the

default state.

–

Intrusion Detection Mode:

Regardless of the state of Param2<1> on a successful execution the Info command returns

the current state of the intrusion latch. If Param2<1> indicates output, and if AuthValid is one

and AuthKey matches SignalKey, then set the intrusion latch to Param2<0>.

•

If the GPIO_Mode field within Config.I2C_Address is set to Input, then the current state of the GPIO

pin is returned to the system firmware without changing the direction of the GPIO pin. This

command will return an error if Param2<1> (driver state) is set to one (output).

•

If the GPIO_Mode field within Config.I2C_Address is set to Output, then the direction of the GPIO

driver will be set to match Param2<1> to zero for input and one for output. If configured as an

Output, then the value in Param2<0> will be driven to the pin. Regardless of the value in Param2,

the current state of the GPIO pin will be returned to the system in the output response parameter.

9.10

Lock Command

The Lock command prevents future modifications of the Configuration and/or Data and OTP zones. If the

device is so configured, then this command can be used to lock individual data slots. This command fails

if the designated area is already locked.

Prior to locking the configuration and/or Data and OTP zones, the ATECC508A can optionally use the

CRC-16 algorithm to verify the contents of the designated zone(s). The calculation uses the same

algorithm as the CRC computed over the input and output groups. This summary digest (CRC) is always

ignored when locking an individual slot.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 74

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