NEC V850ES/F 3-L Series User Manual page 652

Chapter 18
Figure 18-50
Note
652
Generation of receive Generation of receive
completion interrupt completion interrupt
Read CnRGPT register Read CnRGPT register
ROVF = 1? ROVF = 1?
Clear ROVF bit Clear ROVF bit
Yes Yes
RHPM = 1? RHPM = 1?
Clear DN bit Clear DN bit
Read CnMDATAxm, CnMDLCm, Read CnMDATAxm, CnMDLCm,
CnMIDLm, CnMIDHm registers CnMIDLm, CnMIDHm registers
Correct data is read Correct data is read
END END
Note Check the MUC and DN bits using one read access.
Reception via interrupt (using CnRGPT register)
1. Also check the MBON flag at the beginning and at the end of the interrupt
routine, in order to check the access to the message buffers as well as
reception history list registers, in case a pending sleep mode had been
executed. If MBON is detected to be cleared at any check, the actions and
results of the processing have to be discarded and processed again, after
MBON is set again.
It is recommended to cancel any sleep mode requests, before processing
RX interrupts.
2. If ROVF was set once, the receive history list is inconsistent. Consider to
scan all configured receive buffers for receptions.
User's Manual U18743EE1V2UM00
START START
No No
Yes Yes
No No
DN = 0 DN = 0 DN = 0 No No
AND AND AND
Note Note Note
MUC = 0 MUC = 0 MUC = 0
Yes Yes
CAN Controller (CAN)
Illegal data is read Illegal data is read