Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
7
of 42
May 10, 2017
arbitration lost (the message will be aborted in case of one-shot transmissions, and the message will be retained
(retransmitted) in case of normal transmissions). A message will not be successfully sent unless it is sent without an
arbitration lost or while the CAN bus is idle.
In such cases, there is a transmit abort function to discard the message being retransmitted. The transmit abort
function is effective when you want to set a time limit for sending a message, or when you want to send an urgent
high-priority message.
Figure 2-3 shows an application example of the transmit abort function.
Figure 2-3 Application Example of Transmit Abort Function
Receiving
Send Message
Error
Flame
Resend Message
Receive
Transmit Request
Transmit Abort Request
(1) When you want to set a time limit for sending a message
After a specified time from the start of message transmission, you can set a time limit on message transmission by
requesting a transmit abort.
Error
Arbitration lost
Time Limit
(2) When you want to send an urgent high-priority message
If you perform a transmit abort while sending a message, the message being sent will be discarded after it detects
an arbitration lost or error, and you can send a high-priority message.
Arbitration Lost
Message①Transmit
Receive
Message②Transmit
Transmit Abort Request + Transmit Request of High-priority Message②

Renesas RH850 Series Specifications

General

Core	RH850
Operating Voltage	2.7V to 5.5V
Package Options	LQFP, BGA
Communication Interfaces	CAN, LIN, FlexRay, Ethernet, SPI, I2C, UART
Target Applications	Automotive, Industrial
Timers	Multiple timers
ADC	12-bit, 10-bit
Security Features	Hardware Security Module (HSM)
Safety Features	Memory Protection