HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 682
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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In serial reception, the SCI operates as described below.
[1] The SCI performs internal initialization in synchronization with serial clock input or output.
[2] The received data is stored in RSR in LSB-to-MSB order.
[3] If the RIE bit in SCR is set to 1 when the RDRF flag changes to 1, a receive-data-full interrupt
Figure 14.19 shows an example of SCI operation in reception.
Simultaneous serial data transmission and reception (synchronous mode): Figure 14.20
shows a sample flowchart for simultaneous serial transmit and receive operations.
The following procedure should be used for simultaneous serial data transmit and receive
operations.
Rev.4.00 Sep. 07, 2007 Page 652 of 1210
REJ09B0245-0400
Serial
clock
Serial
data
RDRF
ORER
After reception, the SCI checks whether the RDRF flag is 0 and the receive data can be
transferred from RSR to RDR.
If this check is passed, the RDRF flag is set to 1, and the receive data is stored in RDR. If a
receive error is detected in the error check, the operation is as shown in table 14.11.
Neither transmit nor receive operations can be performed subsequently when a receive error
has been found in the error check.
(RXI) request is generated.
Also, if the RIE bit in SCR is set to 1 when the ORER flag changes to 1, a receive-error
interrupt (ERI) request is generated.
RXI interrupt request
generated
Bit 7
Figure 14.19 Example of SCI Receive Operation
RDR data read and
RDRF flag cleared to 0
in RXI interrupt handling
routine
Bit 0
1 frame
Bit 7
Bit 0
RXI interrupt request
generated
Bit 1
ERI interrupt request
generated by overrun
error
Bit 6
Bit 7
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