Snoop mode is used for diagnostic purposes. When in snoop mode, the controller must only be programmed to enter configuration mode or be held in reset. In snoop mode the following actions occur.
•The controller transmits a recessive bitstream onto the CAN bus.
•The controller does not participate in normal bus communication.
•The controller receives messages that are transmitted by other CAN nodes.
•Software can program acceptance filters to dynamically enable/disable and change criteria. Error counters are disabled and cleared to 0. Reads to error counter registers return to 0.