Table 50-16. Wake-up from Stop Mode (continued)
SLFWAK
WAKINT
WAKMSK
Chip
clocks enabled
Wake-up interrupt
generated
1
0
1
No
No
1
1
0
No
No
1
1
1
Yes
Yes
The sensitivity to CAN bus activity can be modified by applying a low-pass filter
function to the Rx CAN input line while in Stop mode. See the WAKSRC bit in in the
description of the Module Configuration Register (CAN_MCR). This feature can be used
to protect FlexCAN from waking up due to short glitches on the CAN bus lines. Such
glitches can result from electromagnetic interference within noisy environments.
50.5.11 Interrupts
The module has many interrupt sources: interrupts due to message buffers and interrupts
due to the ORed interrupts from MBs, Bus Off, Bus Off Done, Error, Wake Up, Tx
Warning, and Rx Warning.
Each one of the message buffers can be an interrupt source, if its corresponding IMASK
bit is set. There is no distinction between Tx and Rx interrupts for a particular buffer,
under the assumption that the buffer is initialized for either transmission or reception.
Each of the buffers has an assigned flag bit in the CAN_IFLAG registers. The bit is set
when the corresponding buffer completes a successful transfer and is cleared when the
CPU writes it to 1 (unless another interrupt is generated at the same time).
Note
It must be guaranteed that the CPU clears only the bit causing
the current interrupt. For this reason, bit manipulation
instructions (BSET) must not be used to clear interrupt flags.
These instructions may cause accidental clearing of interrupt
flags which are set after entering the current interrupt service
routine.
If the Rx FIFO is enabled (CAN_MCR[RFEN] = 1) and DMA is disabled
(CAN_MCR[DMA] = 0), the interrupts corresponding to MBs 0 to 7 have different
meanings. Bit 7 of the CAN_IFLAG1 register becomes the "FIFO Overflow" flag; bit 6
becomes the "FIFO Warning" flag, bit 5 becomes the "Frames Available in FIFO" flag
and bits 4-0 are unused. See the description of the Interrupt Flags 1 Register
(CAN_IFLAG1) for more information.
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
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