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ATmega128
application must load a data packet into T W DR. Subsequently, a specific value must be
written to T W CR, instructing the T W I hardware to transmit the data packet present in
T W DR. W hich value to write is described later on. However, it is important that the
T W INT bit is set in the value written. W riting a one to T W INT clears the flag. The T W I will
not start any operation as long as the T W INT bit in T W CR is set. Immediately after the
application has cleared T W INT, the T W I will initiate transmission of the data packet.
6. W hen the data packet has been transmitted, the T W INT flag in T W CR is set, and T W SR
is updated with a status code indicating that the data packet has successfully been sent.
The status code will also reflect whether a slave acknowledged the packet or not.
7. The application software should now examine the value of T W SR, to make sure that the
data packet was successfully transmitted, and that the value of the ACK bit was as
expected. If T W SR indicates otherwise, the application software might take some special
action, like calling an error routine. Assuming that the status code is as expected, the
application must write a specific value to T W CR, instructing the T W I hardware to transmit
a STOP condition. W hich value to write is described later on. However, it is important that
the T W INT bit is set in the value written. W riting a one to T W INT clears the flag. The T W I
will not start any operation as long as the T W INT bit in T W CR is set. Immediately after
the application has cleared T W INT, the T W I will initiate transmission of the STOP condi-
tion. Note that T W INT is NOT set after a STOP condition has been sent.
209
2467X–AVR–06/11
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