h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 519
h8s-2646
Manufacturer Part Number
h8s-2646
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2646.pdf
(1165 pages)
- Current page: 519 of 1165
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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 13.19 shows an example of SCI operation in reception.
Simultaneous serial data transmission and reception (clocked synchronous mode): Figure
13.20 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.
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 13.11.
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
Figure 13.19 Example of SCI Operation in Reception
Bit 7
RDR data read and
RDRF flag cleared to 0
in RXI interrupt service
routine
Bit 0
1 frame
Bit 7
Section 13 Serial Communication Interface (SCI)
Bit 0
RXI interrupt request
generated
Rev. 5.00 Sep 22, 2005 page 493 of 1136
Bit 1
ERI interrupt request
generated by overrun
error
Bit 6
REJ09B0257-0500
Bit 7
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