Hi !
uPSD323X , from ST, are fast 8051 derivatives with PLD inside.
-The µC part can be programmed with recent C compilers like ke*il or Raisonance...
-The PLD part can be programmed with a special IDE using Abel language
-A JTAG link is used to 'flash' and debug the chip.
You can find usefull informations (codes sample, Applications...) here :
h**p://www.st.com/stonline/products/families/memories/psm/upsd_idx.htm
h**p://www.st.com/stonline/books/ascii/docs/8970.htm
h**p://www.st.com/stonline/books/pdf/docs/10392.pdf
h**p://www.raisonance.com/download/index.php
Regards