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ATmega128
Table 91. Status Codes for Slave Transmitter Mode
Status Code
Application Software Response
(T W SR)
Prescaler Bits
are 0
$A8
Status of the Two-wire Serial Bus
and Two-wire Serial Interface
Hardware
Own SLA+R has been received;
To/from T W DR
Load data byte or
To T W CR
STA
X
STO
0
T W INT
1
T W EA
0
Next Action Taken by T W I Hardware
Last data byte will be transmitted and NOT ACK should
ACK has been returned
be received
Load data byte
X
0
1
1
Data byte will be transmitted and ACK should be re-
ceived
$B0
Arbitration lost in SLA+R/ W as
Load data byte or
X
0
1
0
Last data byte will be transmitted and NOT ACK should
master; own SLA+R has been
be received
received; ACK has been returned
Load data byte
X
0
1
1
Data byte will be transmitted and ACK should be re-
ceived
$B8
Data byte in T W DR has been
Load data byte or
X
0
1
0
Last data byte will be transmitted and NOT ACK should
transmitted; ACK has been
be received
received
Load data byte
X
0
1
1
Data byte will be transmitted and ACK should be re-
ceived
$C0
Data byte in T W DR has been
No T W DR action or
0
0
1
0
Switched to the not addressed slave mode;
transmitted; NOT ACK has been
no recognition of own SLA or GCA
received
No T W DR action or
0
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”
No T W DR action or
1
0
1
0
Switched to the not addressed slave mode;
no recognition of own SLA or GCA;
a START condition will be transmitted when the bus
becomes free
No T W DR action
1
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”;
a START condition will be transmitted when the bus
becomes free
$C8
Last data byte in T W DR has been
No T W DR action or
0
0
1
0
Switched to the not addressed slave mode;
transmitted (T W EA = “0”); ACK
no recognition of own SLA or GCA
has been received
No T W DR action or
0
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”
No T W DR action or
1
0
1
0
Switched to the not addressed slave mode;
no recognition of own SLA or GCA;
a START condition will be transmitted when the bus
becomes free
No T W DR action
1
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”;
a START condition will be transmitted when the bus
becomes free
Figure 103. Formats and States in the Slave Transmitter Mode
Reception of the
own slave address
S
SLA
R
A
DATA
A
DATA
A
P or S
and one or
more data bytes
Arbitration lost as master
and addressed as slave
$A8
A
$B0
$B8
$C0
Last data byte transmitted.
Switched to not addressed
A
All 1's
P or S
slave (TWEA = '0')
$C8
From master to slave
From slave to master
DATA
n
A
Any number of data bytes
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the Two-wire Serial Bus. The
prescaler bits are zero or masked to zero
223
2467X–AVR–06/11
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