HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 507
HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
(846 pages)
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Transmit data
TxD
Serial
data
TDFE
TEND
TXI interrupt
request
TSF flag
Figure 16.4 shows an example of the operation for transmission in asynchronous mode.
• Transmit Data Stop Function
1
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.
Start
Start
bit
bit
Data written to SCFTDR
and TDFE flag read as
1 and then cleared to 0
by TXI interrupt handler
0
0
Figure 16.5 Example of Transmit Data Stop Function
D0
D0
(Example with 8-Bit Data, Parity, One Stop Bit)
Figure 16.4 Example of Transmit Operation
D1
D1
One frame
Data
D7
D6
Parity
D7
0/1
bit
Parity
bit
TXI interrupt
request
0/1
Stop
bit
1
Stop
bit
Start
bit
0
D0
D1
Rev. 1.00, 02/04, page 469 of 804
Data
Start
bit
0
D7
D0
Parity
0/1
bit
D1
Stop
bit
1
(mark state)
D6
Idle state
1
D7
0/1
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