HD64F3670 Datasheet, PDF (204/305 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Start reception
[1] Read the OER flag in the serial status
register (SSR) to determine if there is an
Read OER flag in SSR
[1]
error. If an overrun error has occurred,
execute overrun error processing.
OER = 1
No
Yes
[4]
Error processing
[2] 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.
[3] To continue serial reception, before the
(Continued below)
MSB (bit 7) of the current frame is received,
reading the RDRF flag, reading RDR, and
Read RDRF flag in SSR
[2]
clearing the RDRF flag to 0 should be
finished. When data is read from RDR, the
No
RDRF = 1
RDRF flag is automatically cleared to 0.
[4] If an overrun error occurs, read the OER
flag in SSR, and after performing the
Yes
appropriate error processing, clear the OER
Read receive data in RDR
Yes
All data received?
[3]
No
Clear RE bit in SCR3 to 0
<End>
[4]
Error processing
Overrun error processing
Clear OER flag in SSR to 0
<End>
Figure 13-13 Sample Serial Reception Flowchart(Clocked Synchronous Mode)
Rev. 1.0, 03/01, page 180 of 280