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ATSAM4S-XPLD
654
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
33.10.5.5Reversal after a Repeated Start
Reversal of Read to Write
The master initiates the communication by a read command and finishes it by a write command.
describes the repeated start + reversal from Read to Write mode.
Figure 33-30.Repeated Start + Reversal from Read to Write Mode
Note:
1.
TXCOMP is only set at the end of the transmission because after the repeated start, SADR is detected
again.
again.
Reversal of Write to Read
The master initiates the communication by a write command and finishes it by a read command.
Figure 33-31.Repeated Start + Reversal from Write to Read Mode
Notes: 1. In this case, if TWI_THR has not been written at the end of the read command, the clock is automatically stretched
before the ACK.
2. TXCOMP is only set at the end of the transmission because after the repeated start, SADR is detected again.
S
SADR
R
A
DATA0
A
DATA1
SADR
Sr
NA
W
A
DATA2
A
DATA3
A
P
Cleared after read
DATA0
DATA1
DATA2
DATA3
SVACC
SVREAD
TWD
TWI_THR
TWI_RHR
EOSACC
TXRDY
RXRDY
TXCOMP
As soon as a START is detected
S
SADR
W
A
DATA0
A
DATA1
SADR
Sr
A
R
A
DATA2
A
DATA3
NA
P
Cleared after read
DATA0
DATA2
DATA3
DATA1
TXCOMP
TXRDY
RXRDY
As soon as a START is detected
Read TWI_RHR
SVACC
SVREAD
TWD
TWI_RHR
TWI_THR
EOSACC