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HD6433644R Datasheet(PDF) 337 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 337 Page - Renesas Technology Corp

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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 317 of 526
REJ09B0326-0600
Transmitting: Figure 10.11 shows an example of a flowchart for data transmission. This
procedure should be followed for data transmission after initializing SCI3.
Start
End
Read bit TDRE
in SSR
1
2
3
Write transmit
data to TDR
Read bit TEND
in SSR
Set PDR = 0,
PCR = 1
Clear bit TE to 0
in SCR3
No
TDRE = 1?
Yes
Continue data
transmission?
No
TEND = 1?
No
Yes
Yes
Yes
No
Break output?
Read the serial status register (SSR)
and check that bit TDRE is set to 1,
then write transmit data to the transmit
data register (TDR). When data is
written to TDR, bit TDRE is cleared to 0
automatically.
When continuing data transmission,
be sure to read TDRE = 1 to confirm that
a write can be performed before writing
data to TDR. When data is written to
TDR, bit TDRE is cleared to 0
automatically.
If a break is to be output when data
transmission ends, set the port PCR to 1
and clear the port PDR to 0, then clear bit
TXD in PMR7 and bit TE in SCR3 to 0.
1.
2.
3.
Figure 10.11 Example of Data Transmission Flowchart (Asynchronous Mode)



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