HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 205

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

[4]
Figure 13.13 Sample Serial Reception Flowchart (Clocked Synchronous Mode)
Yes
No
Read receive data in RDR
Clear OER flag in SSR to 0
Clear RE bit in SCR3 to 0
Read RDRF flag in SSR
Overrun error processing
Read OER flag in SSR
All data received?
Error processing
Start reception
RDRF = 1
OER = 1
<End>
<End>
Yes
No
No
(Continued below)
Error processing
Yes
[1]
[2]
[3]
[4]
[1]
[2]
[3]
[4]
Read the OER flag in SSR to determine if
there is an error. If an overrun error has
occurred, execute overrun error processing.
Read SSR and check that the RDRF flag is
set to 1, then read the receive data in RDR.
When data is read from RDR, the RDRF
flag is automatically cleared to 0.
To continue serial reception, before the
MSB (bit 7) of the current frame is received,
reading the RDRF flag and reading RDR
should be finished. When data is read from
RDR, the RDRF flag is automatically
cleared to 0.
If an overrun error occurs, read the OER
flag in SSR, and after performing the
appropriate error processing, clear the OER
flag to 0. Reception cannot be resumed if
the OER flag is set to 1.
Rev. 2.0, 03/02, page 181 of 298