ATMEGA328P_14 Datasheet, PDF (225/344 Pages) ATMEL Corporation – ATMEL 8-BIT MICROCONTROLLER WITH 4/8/16/32KBYTES

Atmel ATmega328P [Preliminary]
Figure 21-14. Formats and States in the Master Receiver Mode
MR
Successfull
reception
S
from a slave
receiver
$08
Next transfer
started with a
repeated start
condition
SLA
R
A
$40
DATA
Not acknowledge
received after the
slave address
Arbitration lost in slave
address or data byte
Arbitration lost and
addressed as slave
A
P
$48
A or A
Other master
continues
$38
A
Other master
continues
$68 $78 $B0
A
DATA
A
P
$50
$58
R_S
SLA
R
$10
W
MT
A
Other master
continues
$38
To corresponding
states in slave mode
From master to slave
From slave to master
DATA
n
Any number of data bytes
A
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the 2-Wire Serial Bus. The
prescaler bits are zero or masked to zero
21.7.3
Slave Receiver Mode
In the Slave Receiver mode, a number of data bytes are received from a Master Transmitter
(see Figure 21-15). All the status codes mentioned in this section assume that the prescaler bits
are zero or are masked to zero.
Figure 21-15. Data transfer in Slave Receiver mode
V_CC
Device 1
Device 2
SLAVE
MASTER
Device 3 ........ Device n
R1
R2
RECEIVER
TRANSMITTER
SDA
SCL
7810C–AVR–10/12
225