Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
30
of 42
May 10, 2017
5. Transmit History Buffer Function
Information on messages that have been transmitted (transmit history data) can be stored in the transmit history
buffer. Each channel has one transmit history buffer, and the transmit history buffer can store 16 transmit history data.
5.1 Transmit History Data Storage Function
You can set the type of buffer from which the message is transmitted and whether to store transmit history data for
each message. The type of buffer from which the message is transmitted can be set during configuration. For the
configuration settings for using the transmit history buffer, refer to "CAN Configuration Application Note".
You can set whether to store transmit history data and label data when sending each message.
For the setting procedure at the time of transmission, refer to "Figure 2-2 Procedure for Sending Messages from
Transmit Buffer ", "Figure 3-2 Message Transmission Procedure from Transmit/receive FIFO Buffer ", and "Figure 4-2
Message Transmission Procedure from Transmit Queue ".
After successful transmission, the following information is stored in the transmit history buffer as transmit history
data.
Buffer type: The buffer where the stored message was sent
Type of (transmit buffer, transmit queue, or transmit/receive FIFO buffer).
Buffer Number: The number of the source transmit buffer, transmit queue, or transmit/receive FIFO buffer (see Table
5-1).
Label data: Label information of transmit messages. Label information can be set when storing transmit messages.
Timestamp: Timestamp value of the transmit message.
Table 5-1 Transmit History Data Buffer Number
Buffer Type
Buffer Number
B’001
B’010
B’100
Transmit buffer
Transmit/receive FIFO buffer
Transmit queue
B’0000
Transmit buffer m×16 + 0
The number of the transmit
buffer linked to the
transmit/receive FIFO buffer
with the CFTML [3: 0] bit of
the CFCCk register
The number of the
transmit buffer assigned
to the transmit queue that
made transmission
B’0001
Transmit buffer m×16 + 1
B’0010
Transmit buffer m×16 + 2
B’0011
Transmit buffer m×16 + 3
B’0100
Transmit buffer m×16 + 4
B’0101
Transmit buffer m×16 + 5
B’0110
Transmit buffer m×16 + 6
B’0111
Transmit buffer m×16 + 7
B’1000
Transmit buffer m×16 + 8
B’1001
Transmit buffer m×16 + 9
B’1010
Transmit buffer m×16 + 10
B’1011
Transmit buffer m×16 + 11
B’1100
Transmit buffer m×16 + 12
B’1101
Transmit buffer m×16 + 13
B’1110
Transmit buffer m×16 + 14
B’1111
Transmit buffer m×16 + 15

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