Figure 18-51: Reception Via Software Polling - NEC V850E/PH2 User Manual

Note: Check the MUC and DN bits using one read access.
Remarks: 1. Also check the MBON flag at the beginning and at the end of the polling 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 pro-
cessed again, after MBON is set again.
2. If ROVF was set once, the receive history list is inconsistent. Consider to scan all config-
ured receive buffers for receptions.
856
Chapter 18 AFCAN Controller

Figure 18-51: Reception via software polling

START START
CINTS1 = 1? CINTS1 = 1?
Yes Yes
Clear CINTS1 bit Clear CINTS1 bit
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
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User's Manual U16580EE3V1UD00
No No
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
Illegal data is read Illegal data is read