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MCP25625 filters in listen only mode

Fabián Inostroza
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2017/03/26 17:48:18 (permalink)

MCP25625 filters in listen only mode

I made a board with this controller/transceiver thinking that it is just an mcp2515 and a mcp2551 glued with a logic converter.
After the boards arrived I was reading the datasheet for this chip where sec 2.6 says:
In Listen-Only mode, both valid and invalid messages will be received regardless of filters and masks or RXM<1:0> bits in the RXBxCTRL registers.
To me that means that filters are ignored in listen-only mode. I though WTF, if you don't want to use filters you just disable them.
Then I made some tests and concluded that filter settings are respected in listen-only mode.
Is this an error in documentation? Did I interpreted wrong the datasheet?, silicon bug not following datasheet?

1 Reply Related Threads

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    Re: MCP25625 filters in listen only mode 2018/09/10 14:09:02 (permalink)
    Initially, I found this description a little misleading as well. I believe what they are trying to describe is that in Listen-Only mode, it is possible to receive invalid messages even when filters are enabled. Unlike Normal mode, where filters would prevent invalid messages from being received.
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