In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Tracy Allen wrote:

I verified your observation today, using an SX48 instead of an SX28.   There was a chance the they might be different.   

But not--Upon port B wakeup from SLEEP, the bits configured to detect LOW to HIGH transitions were all set in wkpdn_b, no matter which bit actually caused the wakeup.   Bits configured to detect HIGH to LOW transitions worked as expected, and retained good information about which bit caused the wakeup/interrupt.   As in your truth table.  And without SLEEP, both edges retained good information. 

Weird.

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