RL78/F13, F14 CHAPTER 18 CAN INTERFACE (RS-CAN LITE)
R01UH0368EJ0210 Rev.2.10 1397
Dec 10, 2015
18.8 Interrupt
The CAN module has 6 interrupts that are grouped into global interrupts and channel interrupts.
Global interrupts (2 interrupts):
• CAN global receive FIFO interrupt
• CAN global error interrupt
Channel interrupts (4 interrupts per channel):
• CANi channel transmit interrupt
CANi transmit complete interrupt
CANi transmit abort interrupt
CANi transmit/receive FIFO transmit complete interrupt (transmit mode)
CANi transmit history interrupt
• CANi transmit/receive FIFO receive interrupt
• CANi channel error interrupt
• CANi wakeup interrupt
• CAN interrupt except CANi wakeup interrupt
When an interrupt request is generated, the corresponding CAN module interrupt request flag is set to 1
(interrupt request present). In that case, when the interrupt enable bit is set to 1 (enabling interrupts), an
interrupt request is output from the CAN module. (Generation of interrupts also is controlled by an interrupt
functions.)
Setting the interrupt request flag to 0 (no interrupt request present) or setting the interrupt enable bit to 0
(disabling interrupts) clears the current interrupt request. The next interrupt request is not generated until the
interrupt request is cleared.
• CANi wakeup interrupt
The CANi wakeup interrupt is generated in every mode when a falling edge in the CRXDi pin is detected. When
the CANi wakeup interrupt is used, set the function of the corresponding port to CRXDi.
The CANi wakeup interrupt is controlled by the interrupt function.
For details on the setting of the interrupt functions, refer to CHAPTER 21 INTERRUPT FUNCTIONS.
Table 18-12 lists the CAN interrupt sources. Figure 18-13 shows the CAN global interrupt block diagram. Figure 18-14
shows the CAN channel interrupt block diagram.
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