Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
17
of 42
May 10, 2017
Figure 2-11 shows the procedure for sending a message from the transmit buffer using the transmit buffer merge
mode.
【Note】1. Rewrite the CmFDCFG register in channel reset mode or channel standby mode.
2. For the TMTRF [1: 0] flag in the TMSTSp register, write "B'00" in channel communication mode or channel
standby mode. Do not write any value other than "B'00".
3. Rewrite the TMIDp register, TMPTRp register, and TMDFb_p register when there is no transmit request in
the corresponding transmit buffer (the TMTRM bit of the TMSTSp register is “0”).
4. Do not write to the TMIDP register, TMPTRp register, TMDF0p register, or TMDF1p register linked to the
transmit/receive FIFO buffer.
5. When setting the standard ID in the transmit ID (the TMID [28: 0] bit of the TMIDp register), set the ID in
b10- b0. Set b28-b11 to “0”.
6. This is valid only when the data is stored in the transmit history buffer (THLDTE bit of the THLCCm
register is “1”, the THLE bit is “1”, and the THLEN bit of the TMIDp register is “1”).
7. Rewrite the TMCp register in channel communication mode or channel standby mode.
8. Set the TMCp register that satisfies the following conditions to "H'00".
Transmit buffer linked to the transmit/receive FIFO buffer
Transmit buffer assigned to the transmit queue
9. When there is no transmit request (the TMTRF [1: 0] flag in the TMSTSp register is “B'00”), set the transmit
request to the transmit buffer of the first buffer (the TMTR bit of the TMCp register is “1”).
Figure 2-11 Message Transmission Procedure in Transmit Buffer Merge Mode
START
Store message in transmit buffer
*3.
、
4.
・ IDE/RTR/ID
*5.
・ Enable or prohibit storage in the transmit history
buffer
・ DLC
・ Transmit buffer data label
*6.
・ 送信データ
END
Set the transmit request of the corresponding
transmit buffer control register
*7.
、
8.
、
9.
No
Yes
Transmit buffer status register
is "H'00"?
Write "B'00" to the transmit buffer transmit result
flag
*2.
Write "B'1" to the transmit buffer merge mode
enable bit
*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