NEC V850/SB1TM User Manual page 481

Table 19-10. Communication Error Source Processing List (2/2)
Occurrence Unit status
condition
Occurrence
condition
Location of
occurrence
Broadcasting Hardware
communication processing
Software
processing
Individual Hardware
communication processing
Software
processing
Occurrence Unit status
condition
Occurrence
condition
Location of
occurrence
Broadcasting Hardware
communication processing
Software
processing
Individual Hardware
communication processing
Software
processing
CHAPTER 19 IEBus CONTROLLER (V850/SB2)
Overrun Error
Reception
DR cannot be read in time before the next
data is received.
Data field
Other than
data field
−
• Reception stops.
• INTIE2 occurs.
• To start bit waiting status
Remarks 1. Communication
between other units
does not end.
2. Data cannot be
received until the
overrun status is
cleared.
−
• DR is read and overrun status
is cleared.
• Error processing (such as
retransmission request)
−
• INTIE2 does not occur.
• NACK is returned.
• Data is retransmitted from
other unit.
Remark Data cannot be
received until overrun
status is cleared.
−
• DR is read and overrun status
is cleared.
• Error processing (such as
retransmission request)
Reception
Received data and received parity do not match.
Other than data field
• Reception stops.
• INTIE2 occurs.
• To start bit waiting status
Remark Communication between other units does not end.
• Error processing (such as retransmission)
• Reception stops.
• INTIE2 occurs.
• To start bit waiting status
• Error processing (such as
retransmission request)
User's Manual U13850EJ4V0UM
Transmission
DR cannot be written in time before the next
data is transmitted.
Data field
Other than
data field
−
• Transmission stops.
• INTIE2 occurs.
• To start bit waiting status
−
• Error processing (such as
−
• Transmission stops.
• INTIE2 occurs.
• To start bit waiting status
−
• Error processing (such as
Parity Error
Data field
• Reception does not stop.
• INTIE2 does not occur.
• NACK is returned.
• Data retransmitted by other
unit is received.
−
Underrun Error
retransmission request)
retransmission request)
Transmission
−
Other than Data field
data field
− −
− −
− −
− −
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