Maybe not a direct fit for your needs but there are four Triscend Configurable System-on-Chip (CSoC) devices with a large amount of XDATA SRAM. The program store is external in a standard byte-wide Flash but you can program the Flash via the four-pin JTAG port. The JTAG port also serves as the connection for the source-level debugger for in-system emulation.

The embedded 8052 is clock accelerated, similar to the Dallas 80C320, but without the second dedicated serial port. However, the CSoC devices have up to 250+ PIO pins and up to 30K-gates of embedded programmable logic where you can create your own peripheral set.

The four devices in production are shown below.

TE502 8Kx8 XDATA SRAM
TE505 16Kx8 XDATA SRAM
TE512 32Kx8 XDATA SRAM
TE520 40Kx8 XDATA SRAM

There is more information available on the Triscend web site at the following link.

http://www.triscend.com/products/IndexE5.html

Steven K. Knapp
Triscend Corporation
E-mail: sknapp@triscend.com