ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 181

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Slave Receiver Mode
2486M–AVR–12/03
Figure 81. Formats and States in the Master Receiver Mode
In the Slave Receiver mode, a number of data bytes are received from a Master Trans-
mitter (see Figure 82). All the status codes mentioned in this section assume that the
prescaler bits are zero or are masked to zero.
Figure 82. Data transfer in Slave Receiver mode
To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:
Successfull
reception
from a slave
receiver
Next transfer
started with a
repeated start
condition
Not acknowledge
received after the
slave address
Arbitration lost in slave
address or data byte
Arbitration lost and
addressed as slave
TWAR
value
SDA
SCL
From master to slave
From slave to master
$08
S
SLA
TWA6
Device 1
RECEIVER
SLAVE
R
TWA5
MR
TRANSMITTER
Device 2
A or A
DATA
MASTER
$40
$48
$38
$68
A
A
A
$78
TWA4
Other master
Other master
n
continues
continues
Device’s Own Slave Address
P
$B0
DATA
Device 3
A
TWA3
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
........
$50
$38
To corresponding
states in slave mode
A
A
TWA2
Device n
Other master
DATA
continues
V
CC
$58
TWA1
A
ATmega8(L)
R1
$10
P
R
S
TWA0
R2
SLA
TWGCE
W
R
181
MT