80C51 Compatible RISC Microcontroller

"The CAST R8051 is a fast single-chip 8-bit microcontroller and is derived from the 80C51 microcontroller. The R8051 is a fully functional 8-bit Embedded Controller that executes all ASM51 instructions and has the same instructions set as the 80C31. The R8051 serves software and hardware interrupts, provides an interface for serial communications, and a timer system. The R8051 is a microcode-free design developed for reuse in FPGA implementations. The design is strictly synchronous with positive-edge clocking, no internal tristates, and a synchronous reset; therfore scan insertion is straightforward.
Device Family Support

Virtex-II Pro

Virtex-II

Spartan-3

Spartan-IIE

Key Features

32-bit Input/Output ports

Two 16-bit Timer/Counters

Serial Peripheral Interfaces in full duplex mode

Interrupt Controller: 5 sources with 2 priority levels

Special Function Registers interface services up to 103 External Special Function Registers

Internal Data Memory interface can address up to 256 B of Data Memory Space

External Memory interface can address up to 64 KB of External Program/Data Memory"