Dallas Chip Question...

The Dallas Semiconductor DS2250T is an 8051 Soft Microcontroller Module, 32 I/O lines, 2 Timers/Counters, 5 Interrupts/2 priority levels, ROM-less, 128 Bytes On-chip RAM, Real-time Clock, 128k Byte XRAM with Battery Backup, Bootstrap Loader.

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SOFTWARE SECURITY
One of the most important features of the Secure Microcontroller
family is firmware/memory security. The devices
were specifically designed to offer an unprecedented
level of protection to the user application
software, preventing unauthorized copying of firmware
and denying access to critical data values. The use of
RAM rather than the traditional ROM or EPROM for program
storage increases the security, since tampering
with the system will result in the loss of the RAM contents.
Additional features such as real–time high–speed
memory encryption, generation of dummy addresses
on the bus, and internal storage of vector RAM increases
the security of a Secure Microcontroller/Microprocessor–
based system.
The DS5002FP Secure Microprocessor Chip and
DS2252T Secure Microcontroller Module offer the highest
level of security, with permanently enabled memory
encryption, a 64–bit random encryption key, and a self–
destruct input for tamper protection. The DS5000FP
Soft Microprocessor Chip and DS5000(T) and
DS2250(T) Soft Microcontroller Modules offer lesser,
but still substantial, protection with optional data encryption
and a 48–bit encryption key.

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