Renesas RX Series

R01UH0823EJ0100 Rev.1.00 Page 1240 of 1823
Jul 31, 2019
RX23W Group 36. CAN Module (RSCAN)
36.2.52 Transmit/Receive FIFO Access Register 0BH (CFPTR0)
x: Don’t care
Modify this register only when the CFCCH0.CFM[1:0] value is 01b (transmit mode).
This register is readable only when the CFCCH0.CFM[1:0] value is 00b (receive mode).
This register can be read/written when the GRWCR.RPAGE bit is 1.
CFPTR[11:0] Bits (Transmit/Receive FIFO Buffer Label Data)
These bits indicate the label information attached to the received message stored in the transmit/receive FIFO buffer
when the CFCCH0.CFM[1:0] value is 00b. When the CFCCH0.CFM[1:0] value is 01b, the CFPTR[7:0] value is stored
in the transmit history buffer when message transmission has been completed.
CFDLC[3:0] Bits (Transmit/Receive FIFO Buffer DLC Data)
These bits indicate the data length of the received message stored in the transmit/receive FIFO buffer when the
CFCCH0.CFM[1:0] value is 00b. When the CFCCH0.CFM[1:0] value is 01b, set the data length of the message to be
transmitted from the transmit/receive FIFO buffer.
If 9-byte or more data length is set, 8 bytes of data is actually transmitted.
Address(es): RSCAN0.CFPTR0 000A 85E6h
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
CFDLC[3:0] CFPTR[11:0]
Value after reset:
0000000000000000
Bit Symbol Bit Name Description R/W
b11 to b0 CFPTR[11:0] Transmit/Receive FIFO Buffer
Label Data
When CFCCH0.CFM[1:0] value is 01b (transmit mode):
Set the label information to be stored in the transmit
history buffer. Only CFPTR[7:0] bits are valid.
When CFCCH0.CFM[1:0] value is 00b (receive mode):
The label information of the received message can be
read.
R/W
b15 to b12 CFDLC[3:0] Transmit/Receive FIFO Buffer
DLC Data
b15 b12
0000:0 data bytes
0001:1 data byte
0010:2 data bytes
0011:3 data bytes
0100:4 data bytes
0101:5 data bytes
0110:6 data bytes
0111:7 data bytes
1 x x x: 8 data bytes
R/W