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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 321 of 526
REJ09B0326-0600
If no receive error is found in the above checks, bit RDRF is set to 1, and the receive data is stored
in RDR. If bit RIE is set to 1 in SCR3, an RXI interrupt is requested. If the error checks identify a
receive error, bit OER, PER, or FER is set to 1 depending on the kind of error. Bit RDRF retains
its state prior to receiving the data. If bit RIE is set to 1 in SCR3, an ERI interrupt is requested.
Table 10.15 shows the conditions for detecting a receive error, and receive data processing.
Note: No further receive operations are possible while a receive error flag is set. Bits OER, FER,
PER, and RDRF must therefore be cleared to 0 before resuming reception.
Table 10.15 Receive Error Detection Conditions and Receive Data Processing
Receive Error Abbreviation Detection Conditions
Received Data Processing
Overrun error
OER
When the next date receive
operation is completed while bit
RDRF is still set to 1 in SSR
Receive data is not transferred
from RSR to RDR
Framing error
FER
When the stop bit is 0
Receive data is transferred
from RSR to RDR
Parity error
PER
When the parity (odd or even)
set in SMR is different from that
of the received data
Receive data is transferred
from RSR to RDR
Figure 10.14 shows an example of the operation when receiving in asynchronous mode.
1 frame
Start
bit
Start
bit
Receive
data
Receive
data
Parity
bit
Stop
bit
Parity
bit
Stop
bit
Mark state
(idle state)
1 frame
0
1
D0
D1
D7
0/1
1
0
1
0
D0
D1
D7
0/1
Serial
data
RDRF
FER
LSI
operation
User
processing
RDRF
cleared to 0
RDR data read
Framing error
processing
RXI request
0 start bit
detected
ERI request in
response to
framing error
Figure 10.14 Example of Operation when Receiving in Asynchronous Mode
(8-Bit Data, Parity, 1 Stop Bit)
Содержание F-ZTAT H8/3642A Series
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Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
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Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
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Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
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Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...