ATMEGA640 datasheet(253/436 Pages) MICROCHIP

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253

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Figure 24-14. Formats and States in the Master Receiver Mode

24.7.3

Slave Receiver Mode

In the Slave Receiver mode, a number of data bytes are received from a Master Transmitter (see Figure 24-15). All

the status codes mentioned in this section assume that the prescaler bits are zero or are masked to zero.

Figure 24-15. Data transfer in Slave Receiver mode

To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:

SLA

DATA

$08

$40

$50

SLA

$10

$48

A or A

$38

Other master

continues

$38

Other master

continues

$68

Other master

continues

$78

$B0

To corresponding

states in slave mode

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

DATA

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

DATA

$58

TWAR

TWA6

TWA5

TWA4

TWA3

TWA2

TWA1

TWA0

TWGCE

value

Device’s Own Slave Address

Device 3

Device n

SDA

SCL

........

Device 2

MASTER

TRANSMITTER

Device 1

SLAVE

RECEIVER

ATMEGA640 Datasheet(PDF) 253 Page - Microchip Technology

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