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112099

FEATURES

8-bit 8051-compatible microcontroller adapts

to task-at-hand:

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8, 32, or 64 kbytes of nonvolatile RAM

for program and/or data memory storage

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Initial downloading of software in end

system via on-chip serial port

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Capable of modifying its own program

and/or data memory in end use

High-reliability operation:

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Maintains all nonvolatile resources for 10

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Power-fail reset

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Early warning power-fail interrupt

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Watchdog timer

Software Security Feature:

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Executes encrypted software to prevent

unauthorized disclosure

On-chip, full-duplex serial I/O ports

Two on-chip timer/event counters

32 parallel I/O lines

Compatible with industry standard 8051

instruction set

Permanently powered real time clock

PIN ASSIGNMENT

DESCRIPTION

The DS2250(T) Soft Microcontroller Module is a fully 8051-compatible 8-bit CMOS microcontroller that

offers “softness” in all aspects of its application. This is accomplished through the comprehensive use of

program/data memory space is implemented using 8, 32, or 64 kbytes of nonvolatile CMOS SRAM.

Furthermore, internal data registers and key configuration registers are also nonvolatile. An optional real

time clock gives permanently powered timekeeping. The clock keeps time to a hundredth of a second

using an on-board crystal. All nonvolatile memory and resources are maintained for over 10 years at

room temperature in the absence of power.

DS2250(T)

Soft Microcontroller Module

www.dalsemi.com

120

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40

40-Pin SIMM