For low-power operation, the FlexCAN module has:
• Module Disable mode:
This low-power mode is entered when the MDIS bit in the MCR Register is asserted
by the CPU and the LPM_ACK is asserted by the FlexCAN. When disabled, the
module requests to disable the clocks to the CAN Protocol Engine and Controller
Host Interface submodules. Exit from this mode is done by negating the MDIS bit in
the MCR register. See
• Stop mode:
This low power mode is entered when Stop mode is requested at chip level and the
LPM_ACK bit in the MCR Register is asserted by the FlexCAN. When in Stop
Mode, the module puts itself in an inactive state and then informs the CPU that the
clocks can be shut down globally. Exit from this mode happens when the Stop mode
request is removed, or when activity is detected on the CAN bus and the Self Wake
Up mechanism is enabled. See
50.3 FlexCAN signal descriptions
The FlexCAN module has two I/O signals connected to the external chip pins. These
signals are summarized in the following table and described in more detail in the next
subsections.
Table 50-2. FlexCAN signal descriptions
Signal
Description
I/O
CAN Rx
CAN Receive Pin
Input
CAN Tx
CAN Transmit Pin
Output
50.3.1 CAN Rx
This pin is the receive pin from the CAN bus transceiver. Dominant state is represented
by logic level 0. Recessive state is represented by logic level 1.
50.3.2 CAN Tx
This pin is the transmit pin to the CAN bus transceiver. Dominant state is represented by
logic level 0. Recessive state is represented by logic level 1.
Chapter 50 CAN (FlexCAN)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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