SAM4L Datasheet, PDF (751/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
Table 28-5. Bus Events
Event
Data is to be received in
slave receiver mode,
SR.STREN is cleared, and
RHR is full
Data is to be transmitted in
slave receiver mode,
SR.STREN is cleared, and
THR is empty
SMBus timeout received
Slave transmitter in SMBus
PEC mode has transmitted
a PEC byte, that was not
identical to the PEC
calculated by the master
receiver.
Slave receiver discovers
SMBus PEC Error
Effect
TWCK is not stretched, read data is discarded.
SR.ORUN is set.
TWCK is not stretched, previous contents of THR is written to bus.
SR.URUN is set.
SR.SMBTOUT is set.
TWCK and TWD are immediately released.
Master receiver will transmit a NAK as usual after the last byte of a
master receiver transfer.
Master receiver will retry the transfer at a later time.
SR.SMBPECERR is set.
NAK returned after the data byte.
42023C–SAM–02/2013
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