Renesas RH850 Series Application Note

RH850 Series CAN Transmit Procedure (CAN FD Mode)
R01AN6029EJ0100 Rev.1.0 Page
23
of 42
May 10, 2017
3.3 Interval Transmission Function
To transmit messages continuously from the same transmit/receive FIFO buffer that is set to transmit mode or
gateway mode
★
, message transmission interval time can be set.
When the use of the transmit/receive FIFO buffer is enabled (the CFE bit of the CFCCk register is “1”), the interval
timer starts counting after the first message is successfully transmitted from the transmit/receive FIFO buffer ((After the
7th bit of EOF in the CAN protocol). After that, when the interval time has elapsed, the next message will be sent and
the interval timer will be reset.
The timing for the interval timer to stop is shown below.
• ・When the use of the transmit/receive FIFO buffer is prohibited (the CFE bit is “0”)
• ・When transitioning to channel reset mode
Table 3-1 shows the count source of the interval timer and the calculation formula of the interval timer, Figure 3-5
shows the block diagram of the interval timer, and Figure 3-6 shows the operation example of the interval timer.
Table 3-1 Interval Timer Count Source and Interval Timer Calculation Formula
CFCCk
Count Source
Interval Timer Calculation
Formula*
CFITR
CFITSS
0
0
Clock obtained by dividing pclk/2 by the value of
the ITRCP [15: 0] bit of the GCFG register
1/f
PBA
× 2 × M × N
1
0
Clock obtained by dividing pclk/2 by the value of
the ITRCP [15: 0] bit of the GCFG register x10.
1/f
PBA
× 2 ×M × 10 × N
-
1
CANm normal bit time clock
1/f
CANBIT
× N
【Note】 M: Divided value of the clock source of the interval timer for FIFO (set value of the
GCFG.ITRCP [15: 0])
N : Message transmission interval (set value of the CFCCk.CFITT [7: 0])
f
PBA
: pclk frequency
f
CANBIT
: Normal CANm bit time clock frequency
Figure 3-5 Block Diagram of the Interval Timer

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