ATmega128 datasheet(222/386 Pages) ATMEL

222 / 386 page

222

2467S–AVR–07/09

ATmega128

Figure 101. Formats and States in the Slave Receiver Mode

Slave Transmitter

Mode

In the Slave Transmitter mode, a number of data bytes are transmitted to a master receiver (see

Figure 102). All the status codes mentioned in this section assume that the prescaler bits are

zero or are masked to zero.

Figure 102. Data Transfer in Slave Transmitter Mode

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

SLA

DATA

$60

$80

$88

$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

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

$80

$A0

P or S

DATA

$70

$90

$98

$78

P or S

DATA

$90

$A0

P or S

General Call

Arbitration lost as master and

addressed as slave by general call

DATA

Device 3

Device n

SDA

SCL

........

Device 2

MASTER

RECEIVER

Device 1

SLAVE

TRANSMITTER

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