ATECC508A datasheet(39/109 Pages) MICROCHIP

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The same timeout applies during the transmission of the command group. After the transmission of a

legal command flag, the I/O Timeout Circuitry is enabled until the last expected data bit is received.

Note: The Timeout Counter is reset after every legal token; therefore, the total time to transmit the

command may exceed the tTIMEOUT interval while the time between bits may not.

The I/O timeout circuitry is disabled when the device is busy executing a command.

5.3.2

Synchronization Procedures

If the device is not busy when the system sends a transmit flag, the device should respond within

tTURNAROUND. If tEXEC time has not already passed, the device may be busy, and the system should poll or

wait until the maximum EXEC time has elapsed. If the device still does not respond to a second transmit

flag within tTURNAROUND, it may be out of synchronization. At this point, the system may take the following

steps to reestablish communication:

Wait tTIMEOUT.

Send the transmit flag.

If the device responds within tTURNAROUND, then the system may proceed with more commands.

Send a wake token.

Wait tWHI.

Send the transmit flag.

The device should respond with a 0x11 return status within tTURNAROUND, after which the system

may proceed with more commands.

ATECC508A

Single-Wire Interface

Datasheet Complete

DS20005927A-page 39

ATECC508A Datasheet(PDF) 39 Page - Microchip Technology