Infineon User's Manual, 12.96 Version 1.0 p. 8-18 has bit field (BTYP) '11: 16-bit Multiplexed Bus'. But startup.a66 (line 55 has '; 3 = 16 Bit Non Multiplexed'. Please explain.
I see the difference between '2' and '3' now. The misunderstanding occurred because a Keil support engineer told me that I should be using startup.a66, even though I had specifically mentioned C161O in my email to him. (In addition to your time and Mike's, this wasted my time when I modified startup.a66.)