I really don't know either, as I've seen lots of different numbers. I'd not easily even consider an 805x type for a new application, though unless the combined cost of the development tools and the piece price of the MCU, distributed over the projected volume, were favorable.

These ARM's cost between $7 and $15 US in moderate quantity lots (1K).

The ARM setups, which I used in the somewhat distant past, were equipped with either 16 or 64 MB of SDRAM and 4-16 MB of FLASH, as well as, in a couple of cases, a bit of SRAM.

In a system requiring that wealth of resources, one would never even consider an 805x, so the comparison's really never been made at my end.

If one compared the resources provided with the "support board" (eval kit), which included the compiler, assembler, linker, loader, debugger, etc, with the cost of a mid-priced 805x + the KEIL development package, the ARM would have won every time, even with much more modest resources, since my client would have had to buy at least one copy of the development package too.

RE