HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 492
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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13. Serial Communication Interface (SCI)
Reception cannot be resumed while a receive error flag is set to 1. Accordingly, clear the ORER,
FER, PER, and RDRF bits to 0 before resuming reception. Figure 13.19 shows a sample flowchart
for serial data reception.
An overrun error occurs or synchronous clocks are output until the RE bit is cleared to 0 when an
internal clock is selected and only receive operation is possible. When reception will be carried out
in a unit of one frame, be sure to carry out a dummy transmission with only one frame by the
simultaneous transmit and receive operations at the same time.
Rev.4.00 Mar. 27, 2008 Page 448 of 882
REJ09B0108-0400
[3]
No
No
Read receive data in RDR, and
clear RDRF flag in SSR to 0
Clear ORER flag in SSR to 0
Read ORER flag in SSR
Read RDRF flag in SSR
Clear RE bit in SCR to 0
Overrun error processing
Figure 13.19 Sample Serial Reception Flowchart
All data received?
Error processing
Start reception
Initialization
ORER = 1
RDRF = 1
<End>
<End>
Yes
Yes
No
(Continued below)
Error processing
Yes
[2]
[1]
[3]
[4]
[5]
[1] SCI initialization:
[2] [3] Receive error processing:
[4] SCI status check and receive data
[5] Serial reception continuation
Set the RxD pin using the PFC.
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.
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.
procedure:
To continue serial reception, before
the MSB (bit 7) of the current frame is
received, reading the RDRF flag,
reading RDR, and clearing the RDRF
flag to 0 should be finished. 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.
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