Temic BOUGHT Atmel. The part number is T89C51RD2 (Atmel parts usually begin AT but last I looked, it was still a T though now sold under the Temic name).

An external bus consumers a lot of pins printed circuit board real estate. I stated designing when external buses was how everything was done BUT I've found I prefer to use multicontrollers with serial IO to any external chips.

If you convert a bus intensive design to all internal FLASH or OTP, you'll have a lot of pins left over. You may find that a derivative 8051 will give you both greater internal memory space AND smaller pinouts. I seem to consume every pinout I have so you'll have to await derivative advice from others. :)

PDF @
http://www.atmel-wm.com/upload/do...2c4bcd.pdf

TEMIC or Atmel @
http://www.atmel-wm.com/

aka j

http://www.geocities.com/mingpzong