HD64F38602R Datasheet, PDF (301/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 14 Serial Communication Interface 3 (SCI3, IrDA)
Start reception
[1] Read the OER flag in SSR to determine if
there is an error. If an overrun error has
Read OER flag in SSR
[1]
occurred, execute overrun error processing.
[2] Read SSR and check that the RDRF flag is
OER = 1?
No
set to 1, then read the receive data in RDR.
Yes
When data is read from RDR, the RDRF
[4]
flag is automatically cleared to 0.
[3] To continue serial reception, before the
Overrun error processing
MSB (bit 7) of the current frame is received,
(Continued below)
reading the RDRF flag and reading RDR
should be finished. When data is read from
Read RDRF flag in SSR
[2]
RDR, the RDRF flag is automatically
cleared to 0.
No
RDRF = 1?
[4] If an overrun error occurs, read the OER
flag in SSR, and after performing the
appropriate error processing, clear the OER
Yes
flag to 0. Reception cannot be resumed if
the OER flag is set to 1.
Read receive data in RDR
Yes
Data reception continued?
[3]
No
Clear RE bit in SCR to 0
<End>
[4]
Start overrun error processing
Overrun error processing
Clear OER flag in SSR to 0
<End>
Figure 14.13 Sample Serial Reception Flowchart (Clock Synchronous Mode)
Rev. 3.00 May 15, 2007 Page 269 of 518
REJ09B0152-0300