Transmit Abort Function - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

Note: When in this state, data can be written to the message slot.

Figure 13.5.2 Operation of the CAN Message Slot Control Register when Transmitting Data Frames

13.5.3 Transmit Abort Function

The transmit abort function is used to cancel a transmit request that has once been set. This is

accomplished by writing H'0F to the CAN Message Slot Control Register for the slot concerned.

When transmit abort is accepted, the CAN module clears the CAN Message Slot Control Register's

TRSTAT (Transmit/Receive Status) bit to 0, allowing for data to be written to the message slot. The

following shows conditions under which transmit abort is accepted:

[Conditions]

• When the target message is waiting for transmission

• When a CAN bus error occurs during transmission

• When the CAN module lost bus arbitration

13.5 Transmitting Data Frames

Transmit aborted

Transmit request

Lost bus arbitration

CAN bus error occurred

transmission