HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 509
HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
(846 pages)
- Current page: 509 of 846
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3. Serial Data Reception
Figures 16.7 and 16.8 show sample flowcharts for serial reception.
Use the following procedure for serial data reception after enabling the SCIF for reception.
No
No
Read DR, ER, and BRK flags in SCSSR
Read receive data from SCFRDR,
and clear RDF flag in SCSSR to 0
Clear RE bit in SCSCR to 0
Read RDF flag in SCSSR
DR V ER V BRK = 1?
All data received?
Start of reception
End of reception
RDF = 1?
Figure 16.7 Sample Serial Reception Flowchart (1)
No
Yes
Yes
Error handling
Yes
1
2
3
1.
2.
3.
Receive error handling and break detection:
Read the DR, ER, and BRK flags in SCSSR to
identify any error, perform the appropriate error
handling, then clear the DR, ER, and BRK flags to 0.
In the case of a framing error, a break can also be
detected by reading the value of the RxD pin.
SCIF status check and receive data read:
Read SCSSR and check that RDF = 1, then read the
receive data in SCFRDR, read 1 from the RDF flag,
and then clear the RDF flag to 0. The transition of the
RDF flag from 0 to 1 can also be identified by an RXI
interrupt.
Serial reception continuation procedure:
To continue serial reception, read at least the receive
trigger set number of data bytes from SCFRDR, read
1 from the RDF flag, and then clear the RDF flag to
0. The number of receive data bytes in SCFRDR can
be ascertained by reading the lower bits of SCFDR.
Rev. 1.00, 02/04, page 471 of 804
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