"how many chips does it have,and the power consumption is ?"
Its an 8051 derivate (20 pin case), working with minimal
a crystal and 3 caps at about 5..20mA (at 3..6V).
It has 2kB Flash and 128B RAM, enough for a wide range of
applications.


"how many bytes?"
6 (2 for every instruction)


"(if you are reading the "pin" you forgot to slap the bits
(port) with 1's) "
already 1's after reset


"and how fast?"
2.5µs at 24MHz


"how easy is recursion?"
like other machines:
Push all needed registers and call itself.
Only the stack size was the limitation:
8051: max 128B
8052: max 256B
DS80C390: max 4kB


"clever code writer can write his own "instructions".. "
Self modified code, how terrible !
You can do it also on the 8051 with external code-RAM.
But I know no C-compiler, which generate such code.



Peter