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ATECC508A bảng dữ liệu(PDF) 39 Page - Microchip Technology

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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:
1.
Wait tTIMEOUT.
2.
Send the transmit flag.
3.
If the device responds within tTURNAROUND, then the system may proceed with more commands.
4.
Send a wake token.
5.
Wait tWHI.
6.
Send the transmit flag.
7.
The device should respond with a 0x11 return status within tTURNAROUND, after which the system
may proceed with more commands.
ATECC508A
Single-Wire Interface
© 2017 Microchip Technology Inc.
Datasheet Complete
DS20005927A-page 39



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