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ATmega128
After a repeated START condition (state $10) the Two-wire Serial Interface can access the
same slave again, or a new slave without transmitting a STOP condition. Repeated START
enables the master to switch between slaves, Master Transmitter mode and Master Receiver
mode without losing control of the bus.
Table 88. Status Codes for Master Transmitter Mode
Status Code
Application Software Response
(T W SR)
Prescaler Bits
are 0
$08
Status of the Two-wire Serial
Bus and Two-wire Serial Inter-
face Hardware
A START condition has been
To/from T W DR
Load SLA+ W
To T W CR
STA
0
STO
0
T W INT
1
T W EA
X
Next Action Taken by T W I Hardware
SLA+ W will be transmitted;
transmitted
ACK or NOT ACK will be received
$10
A repeated START condition
Load SLA+ W or
0
0
1
X
SLA+ W will be transmitted;
has been transmitted
ACK or NOT ACK will be received
Load SLA+R
0
0
1
X
SLA+R will be transmitted;
Logic will switch to master receiver mode
$18
SLA+ W has been transmitted;
Load data byte or
0
0
1
X
Data byte will be transmitted and ACK or NOT ACK will
ACK has been received
be received
No T W DR action or
No T W DR action or
1
0
0
1
1
1
X
X
Repeated START will be transmitted
STOP condition will be transmitted and
T W STO flag will be reset
No T W DR action
1
1
1
X
STOP condition followed by a START condition will be
transmitted and T W STO flag will be reset
$20
SLA+ W has been transmitted;
Load data byte or
0
0
1
X
Data byte will be transmitted and ACK or NOT ACK will
NOT ACK has been received
be received
No T W DR action or
No T W DR action or
1
0
0
1
1
1
X
X
Repeated START will be transmitted
STOP condition will be transmitted and
T W STO flag will be reset
No T W DR action
1
1
1
X
STOP condition followed by a START condition will be
transmitted and T W STO flag will be reset
$28
Data byte has been transmitted;
Load data byte or
0
0
1
X
Data byte will be transmitted and ACK or NOT ACK will
ACK has been received
be received
No T W DR action or
No T W DR action or
1
0
0
1
1
1
X
X
Repeated START will be transmitted
STOP condition will be transmitted and
T W STO flag will be reset
No T W DR action
1
1
1
X
STOP condition followed by a START condition will be
transmitted and T W STO flag will be reset
$30
Data byte has been transmitted;
Load data byte or
0
0
1
X
Data byte will be transmitted and ACK or NOT ACK will
NOT ACK has been received
be received
No T W DR action or
No T W DR action or
1
0
0
1
1
1
X
X
Repeated START will be transmitted
STOP condition will be transmitted and
T W STO flag will be reset
No T W DR action
1
1
1
X
STOP condition followed by a START condition will be
transmitted and T W STO flag will be reset
$38
Arbitration lost in SLA+ W or data
No T W DR action or
0
0
1
X
Two-wire Serial Bus will be released and not addressed
bytes
slave mode entered
No T W DR action
1
0
1
X
A START condition will be transmitted when the bus be-
comes free
214
2467X–AVR–06/11
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