HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 199

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

(A)
Yes
No
Figure 13.8 Sample Serial Data Reception Flowchart (Asynchronous mode)(1)
Read receive data in RDR
Clear RE bit in SCR3 to 0
Read RDRF flag in SSR
Read OER, PER, and
OER+PER+FER = 1
All data received?
FER flags in SSR
Start reception
RDRF = 1
<End>
Yes
No
No
(Continued on next page)
Error processing
[1]
Yes
[2]
[3]
[4]
[1] Read the OER, PER, and FER flags in
[2] Read SSR and check that RDRF = 1,
[3] To continue serial reception, before the
[4] If a receive error occurs, read the OER,
The RDRF flag is cleared automatically.
SSR to identify the error. If a receive
error occurs, performs the appropriate
error processing.
then read the receive data in RDR.
The RDRF flag is cleared automatically.
stop bit for the current frame is
received, read the RDRF flag and read
RDR.
PER, and FER flags in SSR to identify
the error. After performing the
appropriate error processing, ensure
that the OER, PER, and FER flags are
all cleared to 0. Reception cannot be
resumed if any of these flags are set to
1. In the case of a framing error, a
break can be detected by reading the
value of the input port corresponding to
the RxD pin.
Rev. 2.0, 03/02, page 175 of 298