GENERAL DESCRIPTION
The DS2252T secure microcontroller module is an 8051-compatible microcontroller based on nonvolatile RAM technology. It is designed for systems that need to protect memory contents from disclosure. This includes key data, sensitive algorithms, and proprietary information of all types. Like other members of the secure microcontroller family, it provides full compatibility with the 8051 instruction set, timers, serial port, and parallel I/O ports. By using NV RAM instead of ROM, the user can program, then reprogram the microcontroller while in-system. This allows frequent changing of sensitive processes with minimal effort.

FEATURES
■ 8051-Compatible Microcontroller
    8, 32, or 64kbytes of Nonvolatile SRAM for Program and/or Data Memory Storage
    In-System Programming via On-Chip Serial Port
    Capable of Modifying its Own Program and/or Data Memory in the End System
■ Firmware Security Features
    Memory Stored in Encrypted Form
    Encryption Using On-Chip 64-Bit Key
    Automatic True Random Key Generator
    Self-Destruct Input (SDI)
    Improved Security Over Previous Generations
    Protects Memory Contents from Piracy
■ Crashproof Operation
    Maintains All Nonvolatile Resources Up to 10 Years in the Absence of VCC at Room Temperature
    Power-Fail Reset
    Early Warning Power-Fail Interrupt
    Watchdog Timer
    Precision Reference for Power Monitor
■ Fully 8051 Compatible
    128 Bytes Scratchpad RAM
    Two Timer/Counters
    On-Chip Serial Port
    32 Parallel I/O Port Pins
■ Permanently Powered Real-Time Clock