Figure 16.9 Sample Serial Reception Flowchart (1) - Renesas H8S/2437 Hardware Manual

Initialization
Start reception
Read ORER, PER, and
FER flags in SSR
PER FER ORER = 1
No
Read RDRF flag in SSR
No
RDRF = 1
Yes
Read receive data in RDR, and
clear RDRF flag in SSR to 0
No
All data received?
Yes
Clear RE bit in SCR to 0
<End>

Figure 16.9 Sample Serial Reception Flowchart (1)

[1] SCI initialization:
[1]
[2] [3] Receive error processing and break
[2]
Yes
[3]
Error processing
(Continued on next page)
[4]
[4] SCI status check and receive data read:
[5] Serial reception continuation procedure:
[5]
[Legend]
: Logical add (OR)
The RxD pin is automatically
designated as the receive data input
pin.
detection:
If a receive error occurs, read the
ORER, PER, and FER flags in SSR to
identify the error. After performing the
appropriate error processing, ensure
that the ORER, 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.
Read SSR and check that RDRF = 1,
then read the receive data in RDR and
clear the RDRF flag to 0. Transition of
the RDRF flag from 0 to 1 can also be
identified by an RXI interrupt.
To continue serial reception, before the
stop bit for the current frame is
received, read the RDRF flag, read
RDR, and clear the RDRF flag to 0.
Rev. 1.00, 09/03, page 451 of 704