CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
480
19.4.3 Communication error source processing list
The following table shows the occurrence conditions of the communication errors (timing error, NACK reception
error, overrun error, underrun error, and parity error), error processing by the internal IEBus controller, and examples
of processing by software.
Table 19-10. Communication Error Source Processing List (1/2)
Timing Error
Unit status
Reception
Transmission
Occurrence
condition
If bit specification timing is not correct
Occurrence
condition
Location of
occurrence
Other than data field
Data field
Other than data field
Data field
Hardware
processing
• Reception stops.
• INTIE2 occurs
• To start bit waiting status
Remark
Communication between other
units does not end.
• Transmission stops.
• INTIE2 occurs
• To start bit waiting status
Broadcasting
communication
Software
processing
• Error processing (such as retransmission
request)
• Error processing (such as retransmission
request
Hardware
processing
• Reception stops.
• INTIE2 occurs
• NACK is returned.
• To start bit waiting status
• Transmission stops.
• INTIE2 occurs
• To start bit waiting status
Individual
communication
Software
processing
• Error processing (such as retransmission
request)
• Error processing (such as retransmission
request
NACK Reception Error
Unit status
Reception
Transmission
Occurrence
condition
Unit NACK transmission
Unit NACK transmission
Occurrence
condition
Location of
occurrence
Other than data
field
Data field
Other than data
field
Data field
NACK reception
of data of 32nd
byte
Hardware
processing
−
−
−
−
−
Broadcasting
communication
Software
processing
−
−
−
−
−
Hardware
processing
• Reception
stops.
• INTIE2 occurs.
• To start bit
waiting status
• INTIE2 does
not occur.
• Data
retransmitted
by other unit is
received.
• Reception
stops.
• INTIE2 occurs.
• To start bit
waiting status
• INTIE2 does
not occur.
• Retrans-
mission
processing
• INTIE2
occurs
Note
.
• To start bit
waiting status
Individual
communication
Software
processing
• Error
processing
(such as
retransmission
request)
−
• Error
processing
(such as
retransmission
request)
−
• Error
processing
(such as
retransmission
request)
Note
Both ISR.6 (IEERR) and ISR.2 (ENDFRAM) are set to 1.
To reset them, satisfy the conditions in Table 19-8.
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