Rainbow Electronics ATmega128RFA1 - Manual (Page 396)

396
8266A-MCU Wireless-12/09
ATmega128RFA1
0xA0 A STOP condition or
repeated START
condition has been
received while still
addressed as Slave No action 0
0
1
1
0
0
0
0
1
1
1
1
0
1
0
1
Switched to the not addressed Slave
mode; no recognition of own SLA or
GCA
Switched to the not addressed Slave
mode; own SLA will be recognized;
GCA will be recognized if TWGCE =
“1”
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
Switched to the not addressed Slave
mode; own SLA will be recognized;
GCA will be recognized if TWGCE =
“1”; a START condition will be
transmitted when the bus becomes
free
Figure 25-16. Formats and States in the Slave Receiver Mode
S SLA W A DATA A
$60 $80
$88
A
$68
Reception of the own
slave address and one or
more data bytes. All are
acknowledged
Last data byte received
is not acknowledged
Arbitration lost as master
and addressed as slave
Reception of the general call
address and one or more data
bytes
Last data byte received is
not acknowledged
n
From master to slave
From slave to master
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
P or S DATA A
$80 $A0
P or S A
A DATA A
$70 $90
$98
A
$78
P or S DATA A
$90 $A0
P or S A
General Call
Arbitration lost as master and
addressed as slave by general call
DATA A
25.7.4 Slave Transmitter Mode
In the Slave Transmitter mode, a number of data bytes are transmitted to a Master
Receiver (see
Figure 25-17 on page 397). All the status codes mentioned in this section
assume that the prescaler bits are zero or are masked to zero.