NEC V850ES/F 3-L Series User Manual page 647

32-bit single-chip microcontroller

Table of Contents

CAN Controller (CAN)

Figure 18-45

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 TX

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

If TOVF was set once, the transmit history list is inconsistent. Consider to

scan all configured transmit buffers for completed transmissions.

Clear TRQ bit

Wait for 11 CAN data bits

Read CnLOPT register

Message buffer to

be aborted matches CnLOPT

Transmission successful

Transmission abort processing (except normal operation mode with

There is a possibility of starting the transmission without being aborted even if

TRQ bit is cleared, because the transmission request to protocol layer might

already been accepted between 11 bits, total of interframe space (3 bits) and

suspend transmission (8 bits).

Clear the TRQ bit for aborting transmission request, not the RDY bit.

Before making a sleep mode transition request, confirm that there is no

transmission request left using this processing.

The TSTAT bit can be periodically checked by a user application or can be

checked after the transmit completion interrupt.

Do not execute any new transmission request including in the other

message buffers while transmission abort processing is in progress.

User's Manual U18743EE1V2UM00

Transmit abort request

was successful