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ATmega128
Address Packet
Format
All address packets transmitted on the T W I bus are 9 bits long, consisting of 7 address bits, one
READ/ W RITE control bit and an acknowledge bit. If the READ/ W RITE bit is set, a read opera-
tion is to be performed, otherwise a write operation should be performed. W hen a slave
recognizes that it is being addressed, it should acknowledge by pulling SDA low in the ninth SCL
(ACK) cycle. If the addressed slave is busy, or for some other reason can not service the mas-
ter’s request, the SDA line should be left high in the ACK clock cycle. The master can then
transmit a STOP condition, or a REPEATED START condition to initiate a new transmission. An
address packet consisting of a slave address and a READ or a W RITE bit is called SLA+R or
SLA+ W , respectively.
The MSB of the address byte is transmitted first. Slave addresses can freely be allocated by the
designer, but the address 0000 000 is reserved for a general call.
W hen a general call is issued, all slaves should respond by pulling the SDA line low in the ACK
cycle. A general call is used when a master wishes to transmit the same message to several
slaves in the system. W hen the general call address followed by a W rite bit is transmitted on the
bus, all slaves set up to acknowledge the general call will pull the SDA line low in the ack cycle.
The following data packets will then be received by all the slaves that acknowledged the general
call. Note that transmitting the general call address followed by a Read bit is meaningless, as
this would cause contention if several slaves started transmitting different data.
All addresses of the format 1111 xxx should be reserved for future purposes.
Figure 89. Address Packet Format
Addr MSB
Addr LSB
R/W
ACK
SDA
SCL
1
2
7
8
9
START
Data Packet Format
All data packets transmitted on the T W I bus are 9 bits long, consisting of one data byte and an
acknowledge bit. During a data transfer, the master generates the clock and the START and
STOP conditions, while the receiver is responsible for acknowledging the reception. An
Acknowledge (ACK) is signalled by the receiver pulling the SDA line low during the ninth SCL
cycle. If the receiver leaves the SDA line high, a NACK is signalled. W hen the receiver has
received the last byte, or for some reason cannot receive any more bytes, it should inform the
transmitter by sending a NACK after the final byte. The MSB of the data byte is transmitted first.
199
2467X–AVR–06/11
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