HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 683

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Note: * The DMAC is not supported in the H8S/2321.
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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 14.18 Sample Serial Reception Flowchart
Initialization
ORER = 1?
RDRF = 1?
<End>
<End>
Yes
Yes
No
(Continued below)
Error processing
Yes
Section 14 Serial Communication Interface (SCI)
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Rev.6.00 Sep. 27, 2007 Page 653 of 1268
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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:
REJ09B0220-0600