Darrel, thanks for the detailed reply.

I tried this, and was at first delighted to see a strong(er) signal than what I was getting by the 2-pin method.

But, it did not work. I notice the waveform looked different from the 2 pin waveform as well (as seen after the transistor that combined the 2 signals).

I think the problem is, when you control the HWPM *before* and *after* the XOUT line, the spaces between the data bits that XOUT gives, which should remain low, are now consistently transitioning at 120 KHz. I suspect for this to work, like you pointed out earlier, the XOUT macro itself might have to be modified.

Is my analysis correct, or am I being too dense?

Regards,

Anand