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ATmega128
Figure 96. Data Transfer in Master Transmitter Mode
V CC
Device 1
MASTER
Device 2
SLAVE
Device 3
........
Device n
R1
R2
TRANSMITTER
RECEIVER
SDA
SCL
A START condition is sent by writing the following value to T W CR:
TWCR
value
TWINT
1
TWEA
X
TWSTA
1
TWSTO
0
TWWC
X
TWEN
1
–
0
TWIE
X
T W EN must be set to enable the Two-wire Serial Interface, T W STA must be written to one to
transmit a START condition and T W INT must be written to one to clear the T W INT flag. The T W I
will then test the Two-wire Serial Bus and generate a START condition as soon as the bus
becomes free. After a START condition has been transmitted, the T W INT flag is set by hard-
ware, and the status code in T W SR will be $08 (See Table 88 ). In order to enter MT mode,
SLA+ W must be transmitted. This is done by writing SLA+ W to T W DR. Thereafter the T W INT bit
should be cleared (by writing it to one) to continue the transfer. This is accomplished by writing
the following value to T W CR:
TWCR
value
TWINT
1
TWEA
X
TWSTA
0
TWSTO
0
TWWC
X
TWEN
1
–
0
TWIE
X
W hen SLA+ W have been transmitted and an acknowledgment bit has been received, T W INT is
set again and a number of status codes in T W SR are possible. Possible status codes in Master
mode are $18, $20, or $38. The appropriate action to be taken for each of these status codes is
detailed in Table 88 .
W hen SLA+ W has been successfully transmitted, a data packet should be transmitted. This is
done by writing the data byte to T W DR. T W DR must only be written when T W INT is high. If not,
the access will be discarded, and the W rite Collision bit (T WW C) will be set in the T W CR Regis-
ter. After updating T W DR, the T W INT bit should be cleared (by writing it to one) to continue the
transfer. This is accomplished by writing the following value to T W CR:
TWCR
value
TWINT
1
TWEA
X
TWSTA
0
TWSTO
0
TWWC
X
TWEN
1
–
0
TWIE
X
This scheme is repeated until the last byte has been sent and the transfer is ended by generat-
ing a STOP condition or a repeated START condition. A STOP condition is generated by writing
the following value to T W CR:
TWCR
value
TWINT
1
TWEA
X
TWSTA
0
TWSTO
1
TWWC
X
TWEN
1
–
0
TWIE
X
A REPEATED START condition is generated by writing the following value to T W CR:
TWCR
value
TWINT
1
TWEA
X
TWSTA
1
TWSTO
0
TWWC
X
TWEN
1
–
0
TWIE
X
213
2467X–AVR–06/11
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