ATECC508A datasheet(79/109 Pages) MICROCHIP

79 / 109 page

If Mode<1:0> is 0b11, then this command operates in pass-through mode, the input parameter (NumIn)

must be 32 bytes long and TempKey is loaded with NumIn. No SHA-256 calculation is performed, no data

is returned to the system, and TempKey.SourceFlag is set to Input.

Table 9-37. Mode Encoding

Bits

Meaning

7–2 Must be zero.

1–0

00 = Combine new random number with NumIn, store in TempKey. Automatically update EEPROM seed

only if necessary prior to random number generation. Recommended for highest security.

01 = Combine new random number with NumIn, store in TempKey. Generate random number using

existing EEPROM seed, do not update EEPROM seed. (Not recommended for general use.)

10 =

Invalid.

11 =

Operate in pass-through mode and Write TempKey with NumIn.

9.13

Pause Command

All devices on the bus for which the configuration Selector byte does not match the input Selector

parameter will go to the idle mode. This command is used to prevent bus conflicts in a system that

includes multiple ATECC508A devices sharing the same bus.

This command differs from the Idle Flag/Sequence in that individual devices on the single pin bus may be

selected to go into the idle mode, as opposed to the Idle Flag which causes all the CryptoAuthentication

devices on the bus into the idle mode.

If the EEPROM Selector byte does not match the input selector parameter, then the device will

immediately go to the idle mode and no result information will be available. If the input selector parameter

does match the configuration Selector byte, then the device returns a success code of 0x00.

The Pause command cannot be used to put the devices into the sleep mode.

Table 9-38. Input Parameters

Name

Size

Notes

Opcode

PAUSE

0x01

Param1

Selector

All devices that do not match this value go to idle mode.

Param2

Zero

Must be 0x0000.

Data

Ignored

Table 9-39. Output Parameter

Name

Size

Notes

Success

If the command indicates that some other device should idle, ATECC508A returns a value of 0x00.

If this device goes to idle, no value is returned.

9.14

PrivWrite Command

The PrivWrite command is used to write externally generated ECC private keys into the device.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 79

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