Rev. 2.00, 09/03, page 409 of 690
Figure 16.4 shows an example of the operation for transmission in asynchronous mode.
0
1
1
1
0/1
0
1
TDFE
TEND
Parity
bit
Parity
bit
Serial
data
Start
bit
Start
bit
Data
Data
Stop
bit
Stop
bit
Idle state
(mark state)
TXI interrupt
request
Data written to SCFTDR
and TDFE flag read as
1 and then cleared to 0
by TXI interrupt handler
One frame
D0
D1
D7
D0
D1
D7
0/1
TXI interrupt
request
Figure 16.4 Example of Transmit Operation
(Example with 8-Bit Data, Parity, One Stop Bit)
•
Transmit Data Stop Function
When a value in the SCTDSR register is matched with the number of transmit data bytes, this
function stops the transmit operation. Interrupts can be generated and the DMAC can be activated
by setting the TSIE bit (interrupt enable bit).
Figure 16.5 shows an example of operation for the transmit data stop function.
TSF flag
0
D0
D1
D6
D7
0/1
0
D0
D1
D6
D7
0/1
Start
bit
Transmit data
TxD
Parity
bit
Stop
bit
Start
bit
Figure 16.5 Example of Transmit Data Stop Function
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