Section 13 Serial Communication Interface (SCI)
Rev.2.00 Jun. 28, 2007 Page 487 of 666
REJ09B0311-0200
No
<End>
[1]
Yes
Initialization
Start transmission
Read TDRE flag in SSR
[2]
Write transmit data to TDR
and clear TDRE flag in SSR to 0
No
Yes
No
Yes
Read TEND flag in SSR
[3]
No
Yes
[4]
Clear DR to 0 and
set DDR to 1
Clear TE bit in SCR to 0
TDRE = 1
All data transmitted?
TEND = 1
Break output
[1] SCI
initialization:
The TxD pin is automatically
designated as the transmit data
output pin. After the TE bit is set to
1, a 1 is output for a frame, and
transmission is enabled.
[2] SCI state check and transmit data
write:
Read SSR and check that the
TDRE flag is set to 1, then write
transmit data to TDR and clear the
TDRE flag to 0.
[3] Serial transmission continuation
procedure:
To continue serial transmission,
read 1 from the TDRE flag to
confirm that writing is possible,
then write data to TDR, and clear
the TDRE flag to 0. However, the
TDRE flag is checked and cleared
automatically when the DTC is
initiated by a transmit data empty
interrupt (TXI) request and writes
data to TDR.
[4] Break output at the end of serial
transmission:
To output a break in serial
transmission, set DDR for the port
corresponding to the TxD pin to 1,
clear DR to 0, then clear the TE bit
in SCR to 0.
Figure 13.7 Sample Serial Transmission Flowchart
Содержание H8SX/1650
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Страница 470: ...Section 12 Watchdog Timer WDT Rev 2 00 Jun 28 2007 Page 448 of 666 REJ09B0311 0200...
Страница 546: ...Section 13 Serial Communication Interface SCI Rev 2 00 Jun 28 2007 Page 524 of 666 REJ09B0311 0200...
Страница 566: ...Section 14 A D Converter Rev 2 00 Jun 28 2007 Page 544 of 666 REJ09B0311 0200...
Страница 574: ...Section 16 RAM Rev 2 00 Jun 28 2007 Page 552 of 666 REJ09B0311 0200...
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Страница 668: ...Section 20 Electrical Characteristics Rev 2 00 Jun 28 2007 Page 646 of 666 REJ09B0311 0200...
Страница 676: ...Appendix Rev 2 00 Jun 28 2007 Page 654 of 666 REJ09B0311 0200...
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