HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 618

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Serial Data Transmission (Synchronous Mode)
Figure 14.18 shows a sample flowchart for serial transmission.
Use the following procedure for serial data transmission after enabling the SCIF for
transmission.
Write transmit data to SCFTDR
Read TEND flag in SC1SSR
Read TDFE flag in SC1SSR
Clear TE bit to 0 in SCSCR
and clear TDFE flag to 0
Start of transmission
All data transmitted?
Initialization
in SC1SSR
TEND = 1?
TDFE = 1?
End
Figure 14.18 Sample Serial Transmission Flowchart
Yes
Yes
Yes
No
No
No
1
2
3
1. PFC initialization: Set the TxD pin,
2. SCIF status check and transmit data
3. Serial transmission continuation
and the SCK pin if necessary, with
the PFC.
write: Read SC1SSR and check that
TDFE =1, then write transmit data to
the transmit FIFO data register
(SCFTDR) and clear the TDFE flag
to 0.
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.
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