h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 420

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
Rev. 2.00 Dec. 05, 2005 Page 382 of 724
REJ09B0200-0200
No
No
Read receive data in RDR, and
clear RDRF flag in SSR to 0
Clear RE bit in SCR to 0
Read RDRF flag in SSR
Read ORER, PER, and
PER FER ORER = 1
Figure 13.9 Sample Serial Reception Data Flowchart (1)
FER flags in SSR
All data received?
Start reception
Initialization
RDRF = 1
<End>
Yes
Yes
No
(Continued on next page)
Error processing
Yes
[1]
[2]
[4]
[5]
[3]
[1] SCI initialization:
[2] [3] Receive error processing and break
[4] SCI status check and receive data read:
[5] Serial reception continuation procedure:
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.
The RDRF flag is cleared automatically
when DTC is activated by an RXI
interrupt and the RDR value is read.