Datasheet

486
32133D–11/2011
UC3D
Start, Repeated Start, or
Stop received in illegal
position on bus
SR.BUSERR set.
SR.STO and SR.TCOMP may or may not be set depending on the
exact position of an illegal stop.
Data is to be received in
slave receiver mode,
SR.STREN is set, and RHR
is full
TWCK is stretched until RHR has been read.
Data is to be transmitted in
slave receiver mode,
SR.STREN is set, and THR
is empty
TWCK is stretched until THR has been written.
Data is to be received in
slave receiver mode,
SR.STREN is cleared, and
RHR is full
TWCK is not stretched, read data is discarded.
SR.ORUN is set.
Data is to be transmitted in
slave receiver mode,
SR.STREN is cleared, and
THR is empty
TWCK is not stretched, previous contents of THR is written to bus.
SR.URUN is set.
SMBus timeout received
SR.SMBTOUT is set.
TWCK and TWD are immediately released.
Slave transmitter in SMBus
PEC mode has transmitted
a PEC byte, that was not
identical to the PEC
calculated by the master
receiver.
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.
Slave receiver discovers
SMBus PEC Error
SR.SMBPECERR is set.
NAK returned after the data byte.
Table 24-5. Bus Events
Event Effect