21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1088 of 1658
REJ09B0261-0100
(4)
Serial Data Transmission (Clocked Synchronous Mode)
Figure 21.17 shows a sample flowchart for serial transmission.
Use the following procedure for serial data transmission after enabling the SCIF for transmission.
Start of transmission
Initialization
Read TDFE bit in SCFSR
TDFE = 1 ?
All data transmitted?
Read TEND fla
g
in SCFSR
TEND = 1 ?
Clear TE bit in SCSCR to 0
End of transmission
[1] SCIF initialization:
See Sample SCIF Initialization Flowchart in fi
g
ure
21.16.
[2] 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 fla
g
to 0. The transition of the TDFE fla
g
from 0 to 1 can also be identified by a TXI interrupt.
[3] 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.
[1]
[2]
[3]
Yes
No
No
No
Yes
Yes
Write transmit data to SCFTDR and clear
TDFE and TEND bits in SCFSR to 0
Figure 21.17 Sample Serial Transmission Flowchart
Содержание SH7781
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