4 message filtering, Bosch, Message filtering – Rainbow Electronics CAN интерфейс User Manual

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BOSCH

ROBERT BOSCH GmbH, Postfach 300240, D-7000 Stuttgart 30

Sep. 1991

Part B - page 56

4 MESSAGE FILTERING

Message filtering is based upon the whole Identifier. Optional mask registers that allow
any Identifier bit to be set ’don’t care’ for message filtering, may be used to select
groups of Identifiers to be mapped into the attached receive buffers.

If mask registers are implemented every bit of the mask registers must be
programmable, i.e. they can be enabled or disabled for message filtering. The length of
the mask register can comprise the whole IDENTIFIER or only part of it.

Message Filtering