Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
27
of 42
May 10, 2017
4.1.1 Message Transmission Procedure from Transmit Queue
Figure 4-2 shows the procedure for transmitting messages from the transmit queue, and Figure 4-3 and Figure 4-4
show the procedure for enabling or prohibiting the transmit queue.
【Note】 1. If assigned to the transmit queue, write only in the transmit buffer [16 x m + 15].
2. 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".
3. This is valid only when the data is stored in the transmit history buffer (the THLE bit of the THLCCm
register is "1" and the THLEN bit of the TMIDP register is "1").
4. After writing the transmit message to the transmit queue, increment the transmit queue pointer (write "H'FF"
in the TXQPC [7: 0] bit of the TXQPCTRm register).
5. Increment the transmit queue pointer when the transmit queue is used (the TQE bit of the TXQCCm register
is "1") and the transmit queue is not full (the TXQFLL flag in the TXQSTSm register is "0").
Figure 4-2 Message Transmission Procedure from Transmit Queue
START
Store message in the transmit buffer [16 * i +15]
*1
・ IDE/RTR/ID
*2
・ Enable/disable storage in the transmit history buffer
・ DLC
・ Transmit buffer data label
*3
・ Transmit data
END
No
Yes
Is there space in the transmit queue?
Increment the transmit queue pointer
*4
、
5

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