21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1078 of 1658
REJ09B0261-0100
(4)
Serial Data Transmission (Asynchronous Mode)
Figure 21.9 shows a sample flowchart for serial transmission.
Use the following procedure for serial data transmission after enabling the SCIF for transmission.
Start of transmission
Read TDFE fla
g
in SCFSR
TDFE = 1?
Write transmit data in SCFTDR,
and clear TDFE and TEND bits
in SCFSR to 0
All data transmitted?
Read TEND bit in SCFSR
TEND = 1?
Break output?
Clear SPB2DT to 0 and
set SPB2IO to 1
Clear TE bit in SCSCR to 0
End of transmission
No
Yes
No
Yes
No
Yes
No
Yes
[1] SCIF status check and transmit data
write:
Read SCFSR and check that the
TDFE fla
g
is set to 1, then write
transmit data to SCFTDR, and clear
the TDFE and TEND fla
g
s to 0.
The number of transmit data bytes
that can be written is 64 - (transmit
tri
gg
er settin
g
count).
[2] Serial transmission continuation
procedure:
To continue serial transmission, read
1 from the TDFE fla
g
to confirm that
writin
g
is possible, then write data to
SCFTDR, and then clear the TDFE
fla
g
to 0.
[3] Break output at the end of serial
transmission:
To output a break in serial
transmission, clear the SPB2DT bit to
0 and set the SPB2IO bit to 1 in
SCSPTR, then clear the TE bit in
SCSCR to 0.
In [1] and [2], it is possible to
ascertain the number of data bytes
that can be written from the number
of transmit data bytes in SCFTDR
indicated by SCTFDR.
[1]
[2]
[3]
Figure 21.9 Sample Serial Transmission Flowchart
Содержание SH7781
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