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DS2250_1 Datasheet, PDF (1/19 Pages) Dallas Semiconductor – Soft Microcontroller Module | |||
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DS2250(T)
DS2250(T)
Soft Microcontroller Module
FEATURES
PIN ASSIGNMENT
⢠8âbit 8051 compatible microcontroller adapts to taskâ
atâhand:
â 8K, 32K, or 64K bytes of nonvolatile RAM for
program and/or data memory storage
â Initial downloading of software in end system
1
20 21
40
via onâchip serial port
â Capable of modifying its own program and/or
data memory in end use
40-PIN SIMM
⢠Highâreliability operation:
â Maintains all nonvolatile resources for 10 years
in the absence of VCC
â Powerâfail reset
â Early warning powerâfail interrupt
â Watchdog timer
⢠Software Security Feature:
â Executes encrypted software to prevent unau-
thorized disclosure
⢠Onâchip, fullâduplex serial I/O ports
⢠Two onâchip 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 8âbit CMOS microcontroller that offers
âsoftnessâ in all aspects of its application. This is ac-
complished through the comprehensive use of nonvola-
tile technology to preserve all information in the ab-
sence of system VCC. The internal program/data
memory space is implemented using 8K, 32K, or 64K
bytes of nonvolatile CMOS SRAM. Furthermore, inter-
nal data registers and key configuration registers are
also nonvolatile. An optional real time clock gives per-
manently powered timekeeping. The clock keeps time
to a hundredth of a second using an onâboard crystal.
All nonvolatile memory and resources are maintained
for over 10 years at room temperature in the absence of
power.
ECopyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
121395 1/19
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