Definition for: stuff-bit

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Whenever a CAN transmitter detects 5 consecutive bits of identical value in the bit stream, it automatically inserts a complementary stuff-bit. The CAN receiver excludes the stuff­ bits automatically, so that the original message to be transmitted is the very same as the received message. It is used for automatic re-synchronization in the CAN module's bit timing circuitry.

Source CANdictionary (2016) - CiA CAN in Automation -