r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 912

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
Rev. 1.00 Sep. 19, 2008 Page 882 of 1342
REJ09B0467-0100
[3]
No
No
Read receive data in RDR, and
Clear ORER flag in SSR to 0
clear RDRF flag in SSR to 0
Read ORER flag in SSR
Clear RE bit in SCR to 0
Read RDRF flag in SSR
Overrun error handling
All data received?
Start of reception
Error handling
Figure 15.19 Sample Serial Reception Flowchart
Initialization
ORER = 1?
RDRF = 1?
<End>
<End>
Yes
Yes
No
(Continued below)
Error processing
Yes
[2]
[1]
[3]
[4]
[5]
[1]
[2] [3]
[4]
[5]
The RxD pin is automatically
designated as the receive data
input pin.
If a receive error occurs, read the
ORER flag in SSR, and after
performing the appropriate error
handling, clear the ORER flag to
0. Transfer cannot be resumed if
the ORER flag is set to 1.
SCI status check and receive
data read:
Read SSR and check that the
RDRF flag is set to 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.
Serial reception continuation
procedure:
To continue serial reception,
before the MSB (bit 7) of the
current frame is received, finish
reading the RDRF flag, reading
RDR, and clearing the RDRF flag
to 0. The RDRF flag is cleared
automatically when the DMAC or
DTC is activated by a receive-
data-full interrupt (RXI) request
and the RDR value is read.
SCI initialization:
Receive error handling: