Renesas RX Series

R01UH0823EJ0100 Rev.1.00 Page 1233 of 1823
Jul 31, 2019
RX23W Group 36. CAN Module (RSCAN)
36.2.46 Transmit/Receive FIFO Control Register 0H (CFCCH0)
CFM[1:0] Bits (Transmit/Receive FIFO Mode Select)
These bits are used to select transmit/receive FIFO mode. Modify these bits only in global reset mode.
CFITSS Bit (Interval Timer Clock Source Select)
Setting this bit to 0 selects the clock selected by the CFITR bit as the clock source for counting by the interval timer.
Setting this bit to 1 selects the CAN bit time clock as the clock source for counting by the interval timer. Set the
CFCCL0.CFE bit to 0 (no transmit/receive FIFO buffer is used) before modifying the CFITSS bit.
CFITR Bit (Transmit/Receive FIFO Interval Timer Resolution)
This bit is valid when the setting of the CFITSS bit is 0.
Setting this bit to 0 selects the clock obtained by frequency-dividing PCLK by the GCFGH.ITRCP[15:0] value.
Setting this bit to 1 selects the clock obtained by frequency-dividing PCLK by the GCFGH.ITRCP[15:0] value × 10.
Modifying this bit with the CFCCL0.CFE bit set to 0 (no transmit/receive FIFO buffer is used).
CFTML[1:0] Bits (Transmit Buffer Link Configuration)
These bits are used to set the number of transmit buffer to be linked to the transmit/receive FIFO buffer when the
CFM[1:0] bits are set to 01b (transmit mode).
Setting the CFCCL0.CFDC[2:0] bits to 001b or more enables the setting of the CFTML[1:0] bits.
Modify these bits only in global reset mode.
CFITT[7:0] Bits (Message Transmission Interval Configuration)
These bits are used to set a message transmission interval when transmitting messages continuously from a transmit/
receive FIFO buffer whose CFM[1:0] bits are set to 01b (transmit mode).
Set the CFCCL0.CFE bit to 0 (no transmit/receive FIFO buffer is used) and then modify the CFITT[7:0] bits.
Address(es): RSCAN0.CFCCH0 000A 8352h
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
CFITT[7:0] — — CFTML[1:0] CFITR CFITSS CFM[1:0]
Value after reset:
0000000000000000
Bit Symbol Bit Name Description R/W
b1, b0 CFM[1:0] Transmit/Receive FIFO Mode
Select
b1 b0
0 0: Receive mode
0 1: Transmit mode
1 0: Setting prohibited
1 1: Setting prohibited
R/W
b2 CFITSS Interval Timer Clock Source
Select
0: Clock selected by the CFITR bit
1: CAN bit time clock
R/W
b3 CFITR Transmit/Receive FIFO Interval
Timer Resolution
0: Clock obtained by frequency-dividing PCLK by the
ITRCP[15:0] value
1: Clock obtained by frequency-dividing PCLK by the
ITRCP[15:0] value × 10
R/W
b5, b4 CFTML[1:0] Transmit Buffer Link
Configuration
Set the transmit buffer number to be linked to the transmit/
receive FIFO buffer.
R/W
b7, b6 — Reserved These bits are read as 0. The write value should be 0. R/W
b15 to b8 CFITT[7:0] Message Transmission Interval
Configuration
Set a message transmission interval.
Set these bits to a value within a range of 00h to FFh.
R/W