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• 100% backward compatibility with previous FlexCAN version
• Supports Pretended Networking functionality in low power: Stop mode
49.2.3 Modes of operation
The FlexCAN module has these functional modes:
• Normal mode (User or Supervisor):
In Normal mode, the module operates receiving and/or transmitting message frames,
errors are managed normally, and all CAN Protocol functions are enabled. User and
Supervisor modes differ in the access to some restricted control registers.
• Freeze mode:
Freeze mode is enabled when MCR[FRZ] is asserted. If enabled, Freeze mode is
entered when MCR[HALT] is set or when Debug mode is requested at chip level and
MCR[FRZ_ACK ] is asserted by the FlexCAN. In this mode, no transmission or
reception of frames is done and synchronicity to the CAN bus is lost. See
• Loop-Back mode:
The module enters this mode when CTRL1[LPB] is asserted. In this mode, FlexCAN
performs an internal loop back that can be used for self-test operation. The bit stream
output of the transmitter is internally fed back to the receiver input. The Rx CAN
input pin is ignored and the Tx CAN output goes to the recessive state (logic '1').
FlexCAN behaves as it normally does when transmitting and treats its own
transmitted message as a message received from a remote node. In this mode,
FlexCAN ignores the bit sent during the ACK slot in the CAN frame acknowledge
field to ensure proper reception of its own message. Both transmit and receive
interrupts are generated.
• Listen-Only mode:
The module enters this mode when CTRL1[LOM] is asserted. In this mode,
transmission is disabled, all error counters are frozen, and the module operates in a
CAN Error Passive mode. Only messages acknowledged by another CAN station
will be received. If FlexCAN detects a message that has not been acknowledged, it
will flag a BIT0 error (without changing the REC), as if it was trying to acknowledge
the message.
• CAN FD Active mode:
Introduction
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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