If you look at the Cypress PSOC there are parts well under $ 1, M0
core, all 32 bit parts, as well as M3 core ~ $4. What other vendors do not
have is a rich library of analog (more than just A/D), routability of
connections and modules, on chip .1% reference, DSP capability,
and tools excellent, GUI based, and support both C and Verilog (for the
special HW you want to design).
Core ARM based cores, mainstream of industry now. Both in ASIC,
FPGA, as well as standalone. Cores are ARM M0, M0+, M3, all 32
bit cores. And one family 8051 core.
Tool is called PSOC Creator. Many basic and advanced videos to learn
from.
http://www.cypress.com/video-libraryRegards, Dana.