RL78/F13, F14 CHAPTER 18 CAN INTERFACE (RS-CAN LITE)
R01UH0368EJ0210 Rev.2.10 1343
Dec 10, 2015
• CFRXIF Flag
The CFRXIF flag is set to 1 when the following condition is met.
• When CFM[1:0] value is B'00 and interrupt source setting the CFIM bit in the CFCCLk register is generated.
The CFRXIF flag is cleared to 0 when any of the following conditions is met.
• Write 0 to the CFRXIF flag
• When CFM[1:0] value is B'00: In global reset mode
• When CFM[1:0] value is B'01: In channel reset mode
Clear this flag to 0 in global operating mode or global test mode.
• CFMLT Flag
The CFMLT flag is set to 1 when the following condition is met.
• When it is attempted to store a new message while the transmit/receive FIFO buffer is full. In this case, the
new message is discarded.
The CFMLT flag is cleared to 0 when any of the following conditions is met.
• Write 0 to the CFMLT flag
• When CFM[1:0] value is B'00: In global reset mode
• When CFM[1:0] value is B'01: In channel reset mode
Clear this flag to 0 in global operating mode or global test mode.
• CFFLL Flag
The CFFLL flag is set to 1 when the following condition is met.
• When the number of messages stored in the transmit/receive FIFO buffer matches the FIFO buffer depth set
by the CFDC[2:0] bits in the CFCCLk register.
The CFFLL flag is cleared to 0 when any of the following conditions is met.
• When the number of messages stored in the transmit/receive FIFO buffer becomes smaller than the FIFO
buffer depth set by the CFDC[2:0] bits.
• When the CFE value in the CFCCLk register is 0 (no transmit/receive FIFO buffer is used).
Note that this flag is set to 0 after transmission completion, CAN bus error detection, or arbitration lost when
the message in the transmit/receive FIFO buffer is being transmitted or to be transmitted next.
• When CFM[1:0] value is B'00: In global reset mode
• When CFM[1:0] value is B'01: In channel reset mode
• CFEMP Flag
The CFEMP flag is set to 1 when any of the following conditions is met.
• When the CFM[1:0] value is B'00: All messages have been read, or global reset mode.
• When the CFM[1:0] value is B'01: All messages have been transmitted, or channel reset mode.
• When the CFE value in the CFCCLk register is 0 (no transmit/receive FIFO buffer is used).
Note that this flag is set to 1 after transmission completion, CAN bus error detection, or arbitration lost when
the message in the transmit/receive FIFO buffer is being transmitted or to be transmitted next.
The CFEMP flag is cleared to 0 when any of the following conditions is met.
• When the CFM[1:0] value is B'00: Any one of received messages has been stored in the transmit/receive FIFO
buffer.
• When the CFM[1:0] value is B'01: A value H'FF has been written to the CFPCTRk register after data was
written to the CFIDLk, CFIDHk, CFPTRk, and CFDF0k to CFDF3k registers.
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