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HD64F7144FW50V Datasheet, PDF (487/932 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 | |||
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13. Serial Communication Interface (SCI)
Initialization
[1]
[1] SCI initialization:
Set the RxD pin using the PFC.
Start reception
[2] ID reception cycle:
Set the MPIE bit in SCR to 1.
Set MPIE bit in SCR to 1
[2]
Read ORER and FER flags
in SSR
Yes
FERâ¨ORER = 1
No
Read RDRF flag in SSR
[3]
No
RDRF = 1
Yes
Read receive data in RDR
No
This stationâs ID?
Yes
Read ORER and FER flags
in SSR
Yes
FERâ¨ORER = 1
No
[3] SCI status check, ID reception and
comparison:
Read SSR and check that the RDRF
flag is set to 1, then read the receive
data in RDR and compare it with this
stationâs ID.
If the data is not this stationâs ID, set the
MPIE bit to 1 again, and clear the RDRF
flag to 0.
If the data is this stationâs ID, clear the
RDRF flag to 0.
[4] SCI status check and data reception:
Read SSR and check that the RDRF
flag is set to 1, then read the data in
RDR.
[5] Receive error processing and break
detection:
If a receive error occurs, read the ORER
and FER flags in SSR to identify the
error. After performing the appropriate
error processing, ensure that the ORER
and FER flags are all cleared to 0.
Reception cannot be resumed if either
of these flags is set to 1.
In the case of a framing error, a break
can be detected by reading the RxD pin
value.
Read RDRF flag in SSR
[4]
No
RDRF = 1
Yes
Read receive data in RDR
No
All data received?
[5]
Yes
Clear RE bit in SCR to 0
Error processing
(Continued on
next page)
<End>
Figure 13.13 Sample Multiprocessor Serial Reception Flowchart (1)
Rev.4.00 Mar. 27, 2008 Page 441 of 882
REJ09B0108-0400
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