What does pin function name with _b suffix specify?

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What does pin function name with _b suffix specify?

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rev
Contributor III

Some Kinetis pin functions have a _b suffix.  There's the RESET_b pin, but also others such as UART0_CTS_b.

I've tried searching datasheet and user manual but can't seem to find out what this indicates.  Of course there are 100's of matches on _b so I may have missed it.

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mjbcswitzerland
Specialist V

Hi Jonathan

_b means that it is negative logic (eg. RESET_b is reset with a '0', or UART3_RTS_b asserts to '0'). Others will "tend" to be positive logic (asserts to '1' or react to '1' at input).

Regards

Mark

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mjbcswitzerland
Specialist V

Hi Jonathan

_b means that it is negative logic (eg. RESET_b is reset with a '0', or UART3_RTS_b asserts to '0'). Others will "tend" to be positive logic (asserts to '1' or react to '1' at input).

Regards

Mark

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rev
Contributor III

Ah, of course, silly me!  What threw me was that some ADC signals also have a 'b' suffix.  Now clearly that means the alternate location since there are ADC signals with 'a' suffix also.

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mjbcswitzerland
Specialist V

Jonathan

Yes, the ADCs have a mux which allows their channel input to be set to either Mux a or Mux b position (although some packages don't support both and in this case there is neither _a nor _b).

Regards

Mark

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