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

In Figure 7-1, you will notice that the port B pin inputs directly to the WKPND_B logic, without also having an input from WKEN_B. This indicates that WKPND_B can operate independently of WKEN_B until their outputs join at the AND gate to cause the actual interrupt.

Nearly every micro I've worked with operates in this fashion: each interrupt has both a pending bit and an enable bit, and the pending bit is set whether the enable bit is also set or not. The only (and very unfortunate) exception to this that I've ever seen is the lack of a pending bit for RTCC overflow in the SX20/28.

-Phil

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