Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Mar. 14, 2006 Page 425 of 804
REJ09B0104-0300
Transfer direction
Bit 0
Serial data
Synchronization
clock
1 frame
TDRE
TEND
Data written to TDR
and TDRE flag cleared
to 0 in TXI interrupt
processing routine
TXI interrupt
request generated
Bit 1
Bit 7
Bit 0
Bit 1
Bit 6
Bit 7
TXI interrupt
request generated
TEI interrupt request
generated
Figure 12.16 Example of Operation for Transmission in Clocked Synchronous Mode
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]
Clear TE bit in SCR to 0
TDRE = 1
All data transmitted
TEND = 1
[1] SCI
initialization:
The TxD pin is automatically
designated as the transmit data output
pin.
[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, be
sure to read 1 from the TDRE flag to
confirm that writing is possible, then
write data to TDR, and then clear the
TDRE flag to 0. However, the TDRE
flag is checked and cleared
automatically when the DMAC is
initiated by a transmit data empty
interrupt (TXI) request and writes data
to TDR.
Figure 12.17 Sample Serial Transmission Flowchart
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Содержание H8SX series
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