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Figure 16-6 shows an example of the operation for transmission in asynchronous mode.
Start
1
bit
0
D0
TDRE
TEND
TXI interrupt
Data written to TDR and
request generated
TDRE flag cleared to 0 in
TXI interrupt service routine
Figure 16-6 Example of Operation in Transmission in Asynchronous Mode
624
Data
Parity
bit
D1
D7
0/1
TXI interrupt
request generated
1 frame
(Example with 8-Bit Data, Parity, One Stop Bit)
Stop
Start
bit
bit
1
0
D0
D1
Data
Parity
Stop
bit
bit
D7
0/1
1
TEI interrupt
request generated
1
Idle state
(mark state)
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