DS2250T Datasheet, PDF (1/20 Pages) Dallas Semiconductor – Soft Microcontroller Module

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DS2250(T)
Soft Microcontroller Module
FEATURES
PIN ASSIGNMENT
8-bit 8051-compatible microcontroller adapts
to task-at-hand:
- 8, 32, or 64 kbytes of nonvolatile RAM
for program and/or data memory storage
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20
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40
- Initial downloading of software in end
system via on-chip serial port
- Capable of modifying its own program
40-Pin SIMM
and/or data memory in end use
High-reliability operation:
- Maintains all nonvolatile resources for 10
years in the absence of V_CC
- Power-fail reset
- Early warning power-fail interrupt
- Watchdog timer
Software Security Feature:
- 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
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
nonvolatile technology to preserve all information in the absence of system V_CC. The internal
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.
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