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Section 15 Serial Communication Interface with FIFO
Page 764 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Transmitting Serial Data (Clock Synchronous Mode)
Figure 15.13 shows a sample flowchart for transmitting serial data.
Use the following procedure for serial data transmission after enabling transmit operation.
Start of transmission
Read TDFE flag in SCFSR
TDFE = 1?
Write transmit data to SCFTDR,
read TDFE and TEND flags
in SCFSR as 1,
and then clear the flags to 0
All data transmitted?
Read TEND flag in SCFSR
TEND = 1?
Clear TE bit in SCSCR to 0
End of transmission
No
Yes
No
Yes
No
Yes
[1] Status check and transmit data write:
Read SCFSR and check that the
TDFE flag is set to 1, then write
transmit data to SCFTDR. Clear the
TDFE and TEND flags to 0 after
reading them as 1.
[2] Serial transmission continuation
procedure:
To continue serial transmission, read
1 from the TDFE flag to confirm that
writing is possible, then write data to
SCFTDR, and then clear the TDFE
flag to 0.
[1]
[2]
Figure 15.13 Sample Flowchart for Transmitting Serial Data