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

Dan,

First, have you tried putting a switch to ground on that open drain line and seeing if your code will see that?  Second, is the sound board interrupt a pulse that goes to ground briefly and then returns, or does it stay low until reset by setting a register?  If it's a pulse, it's more than likely that the duration is to short.

Thanks,
PeterM

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