Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER

R01UH0042EJ0500 Rev.5.00 Page 980 of 1513

Aug 12, 2011

Figure 20-27. Setting Transmission Request (TRQ) to Transmit Message Buffer After Redefinition

Execute

transmission?

Wait for 1 bit of CAN data.

Set TRQ bit

Set TRQ bit = 1

Clear TRQ bit = 0

Yes

Redefinition completed

END

Cautions 1. When a message is received, reception filtering is performed in accordance with the ID and mask

set to each receive message buffer. If the procedure in Figure 20-39 is not observed, the contents

of the message buffer after it has been redefined may contradict the result of reception (result of

reception filtering). If this happens, check that the ID and IDE received first and stored in the

message buffer following redefinition are those stored after the message buffer has been

redefined. If no ID and IDE are stored after redefinition, redefine the message buffer again.

2. When a message is transmitted, the transmission priority is checked in accordance with the ID,

IDE, and RTR bits set to each transmit message buffer to which a transmission request was set.

The transmit message buffer having the highest priority is selected for transmission. If the

procedure in Figure 20-27 is not observed, a message with an ID not having the highest priority

may be transmitted after redefinition.

20.8.4 Transition from initialization mode to operation mode

The CAN module can be switched to the following operation modes.

• Normal operation mode

• Normal operation mode with ABT

• Receive-only mode

• Single-shot mode

• Self-test mode