HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 340
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HD6437101
Manufacturer Part Number
HD6437101
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6437101.pdf
(560 pages)
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Section 10 Serial Communication Interface (SCI)
10.4.5
Figure 10.6 shows an example of the operation for transmission in asynchronous mode. In
transmission, the SCI operates as described below.
1. The SCI monitors the TDRE flag in SSR, and if is cleared to 0, recognizes that data has been
2. After transferring data from TDR to TSR, the SCI sets the TDRE flag to 1 and starts
3. Data is sent from the TxD pin in the following order: start bit, transmit data, parity bit, or
4. The SCI checks the TDRE flag at the timing for sending the stop bit.
5. If the TDRE flag is 0, the data is transferred from TDR to TSR, the stop bit is sent, and then
6. If the TDRE flag is 1, the TEND flag in SSR is set to 1, the stop bit is sent, and then the “mark
Figure 10.7 shows a sample flowchart for transmission in asynchronous mode.
Rev.1.00 Sep. 18, 2008 Page 306 of 522
REJ09B0069-0100
TxD
TDRE
TEND
written to TDR, and transfers the data from TDR to TSR.
transmission. If the TIE bit is set to 1 at this time, a transmit data empty interrupt request
(TXI) is generated. Because the TXI interrupt routine writes the next transmit data to TDR
before transmission of the current transmit data has finished, continuous transmission can be
enabled.
multiprocessor bit (may be omitted depending on the format), and stop bit.
serial transmission of the next frame is started.
state” is entered in which 1 is output. If the TEIE bit in SCR is set to 1 at this time, a TEI
interrupt request is generated.
TXI interrupt
request
generated
Figure 10.6 Example of Operation in Transmission in Asynchronous Mode
1
Data Transmission (Asynchronous Mode)
Start
bit
0
Data written to TDR
and TDRE flag cleared
to 0 in TXI interrupt
processing routine
D0
(Example with 8-Bit Data, Parity, One Stop Bit)
D1
One frame
Data
D7
Parity
bit
0/1
TXI interrupt
request
generated
Stop
bit
1
Start
bit
0
D0
D1
Data
D7
Parity
bit
0/1
TEI interrupt
request
generated
Stop
bit
1
Idle state
(mark state)
1
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