Communication Error Cause Processing List - NEC Renesas V850/SC1 User Manual

18.4.3 Communication error cause processing list

The occurrence conditions for communication errors (timing errors, NACK reception errors, overrun errors,
underrun errors, and parity errors), the internal IEBus controller error processing contents, and an example of
processing by software are described below.
Table 18-10. Communication Error Cause Processing List (1/2)
Occurrence Local node
condition status
Occurrence
condition
Occurrence
location
During Hardware
broadcast processing
communication
Software
processing
During individual Hardware
communication processing
Software
processing
Occurrence Local node
condition status
Occurrence
condition
Occurrence
location
During Hardware
broadcast processing
communication
Software
processing
During individual Hardware
communication processing
Software
processing
Note Both the IEERR and ENDFRAM bits of the ISR register are set (1).
To reset these bits, follow the conditions specified in Table 18-8.
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CHAPTER 18 IEBus CONTROLLER (V850/SC2)
During reception
When bit timing is off
Other than data field Data field
• Reception stopped
• INTIE2 generated
• To start bit wait status
Remark Communication between other
nodes does not stop.
• Error processing (resend request, etc.)
• Reception stopped
• INTIE2 generated
• NACK returned
• To start bit wait status
• Error processing (resend request, etc.)
During reception
Local node NACK transmission
Other than data Data field
field
− −
− −
• Reception • INTIE2 not
stopped generated
• INTIE2 • Receive data
generated resent by other
• To start bit
node
wait status
• Error −
processing
(resend
request, etc.)
User's Manual U15109EJ3V0UD
Timing Error
During transmission
Other than data field
• Transmission stopped
• INTIE2 generated
• To start bit wait status
• Error processing (resend request, etc.)
• Transmission stopped
• INTIE2 generated
• To start bit wait status
• Error processing (resend request, etc.)
NACK Reception Error
During transmission
NACK reception
Other than data Data field
field
− −
− −
• Transmission • INTIE2 not
stopped generated
• INTIE2 • Resend
generated processing
• To start bit
wait status
• Error −
processing
(resend
request, etc.)
Data field
NACK reception
for 32nd byte
data
−
−
• INTIE2
Note
generated
• To start bit
wait status
• Error
processing
(resend
request, etc.)