HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 501

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

[3]
No
No
Read receive data in RDR, and
Clear ORER flag in SSR to 0
clear RDRF flag in SSR to 0
Overrun error processing
Read ORER flag in SSR
Clear RE bit in SCR to 0
Read RDRF flag in SSR
All data received?
Error processing
Start reception
Initialization
ORER = 1?
RDRF = 1?
Figure 12.18 Sample Serial Reception Flowchart
<End>
<End>
Yes
Yes
No
(Continued below)
Error processing
Yes
[2]
Section 12 Serial Communication Interface (SCI)
[1]
[3]
[4]
[5]
Note: * The case, in which the DTC
Rev.3.00 Mar. 26, 2007 Page 459 of 772
[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
processing, 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 DTC * is
activated by a receive data full
interrupt (RXI) request and the
RDR value is read.
SCI initialization:
automatically clears the RDRF
flag, occurs only when DISEL in
DTC is 0 with the transfer
counter not being 0. Therefore,
the RDRF flag should be cleared
by CPU when DISEL is 1, or
when DISEL is 0 with the
transfer counter being 0.
Receive error processing:
REJ09B0355-0300