View ds2252t datasheet:

DS2252T Secure Microcontroller Module www.dalsemi.com FEATURES PACKAGE OUTLINE 8051-compatible microcontroller for secure/sensitive applications - 32, 64, or 128 kbytes of nonvolatile 120 21 40 SRAM for program and/or data storage - In-system programming via on-chip serial port 40-Pin SIMM - Capable of modifying its own program 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 - SDI (Self-Destruct Input) - Improved security over previous generations - Protects memory contents from piracy Crashproof operation - Maintains all nonvolatile resources for over 10 years in the absence of power - Power-fail Reset - Early Warning Power-fail Interrupt