ATmega16 datasheet(189/357 Pages) ATMEL

189 / 357 page

189

2466S–AVR–05/09

ATmega16(L)

Figure 87. Formats and States in the Master Transmitter Mode

Master Receiver Mode

In the Master Receiver mode, a number of data bytes are received from a Slave Transmitter

(see Figure 88). In order to enter a Master mode, a START condition must be transmitted. The

format of the following address packet determines whether Master Transmitter or Master

Receiver mode is to be entered. If SLA+W is transmitted, MT mode is entered, if SLA+R is trans-

mitted, MR mode is entered. All the status codes mentioned in this section assume that the

prescaler bits are zero or are masked to zero.

SLA

DATA

$08

$18

$28

SLA

$10

$20

$30

A or A

$38

Other master

continues

A or A

$38

Other master

continues

$68

Other master

continues

$78

$B0

To corresponding

states in slave mode

Successfull

transmission

to a slave

receiver

Next transfer

started with a

repeated start

condition

Not acknowledge

received after the

slave address

Not acknowledge

received after a data

byte

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

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