Atmel SAM4 Series - Extra Information; Acronyms

AT07334: SAM4 TWI Master Mode Driver [APPLICATION NOTE]
42274A-MCU-05/2014
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6. Extra Information
6.1 Acronyms
Term Definition
SCR Status Clear Register
NAK Negative Acknowledgement
DNAK Negative Acknowledgement int TWI data phase
ANAK Negative Acknowledgement int TWI address phase
ARBLST Arbitration lost to a higher priority bus master in TWI
multi-master mode
IER Interupt Enable Register