Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
8
of 42
May 10, 2017
When a transmit request is issued (the TMTRM bit of the TMSTSp register is “1”) and a transmit abort request is
issued to the transmit buffer (the TMTAR bit of the TMCp register is “1”), the transmit request is cancelled.
The timing of the actual abort after issuing the transmit abort request is shown below.
The message being sent or the message determined to be sent next by the priority determination of transmission
・When an arbitration lost occurs
・When an error occurs
Messages other than the above
・When a transmit abort request is issued
When the transmit abort is completed, the TMTRF [1: 0] flag in the TMSTSp register becomes “B’01” and the
transmit request is canceled (the TMTRM bit becomes “0”).
After issuing a transmit abort request to the message being sent or the message determined to be sent next by the
priority determination of transmission, if the transmission is completed successfully without an arbitration lost or error,
the transmission is completed: There is an abort request (TMTRF [1: 0] flag is “B'11”).
Figure 2-4 shows the operation during transmit abort.
Figure 2-4 Operation during Transmit Abort
Transmit buffer
Msg
Msg
CAN Bus
Msg (sending)
Transmit abort interrupt source activated
Transmit abort completed
Stop when an arbitration
lost or an error occurs
Abort request
Transmit buffer
Msg
Msg
CAN Bus
Msg
Transmission completion interrupt source activated
occurrence
Programmatically
・ Transmit data set
・ Transmit request set
(・ One-shot request set)
Transmission completed:
There is an abort
request
Abort request
Transmit buffer 0
MsgA
MsgA
CAN Bus
MsgB
Transmit abort interrupt source activated
Transmit abort completed
before transmission
Abort request
Programmatically
・ Transmit data set
・ Transmit request set
(・ One-shot request set)
MsgB
MsgB
Transmission
completed
Transmission data
Transmission data
Transmission data
Transmit buffer 1

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