Microcontroller Module. DS2250 Datasheet

DS2250 Module. Datasheet pdf. Equivalent

Part DS2250
Description Soft Microcontroller Module
Feature www.DataSheet4U.com DS2250(T) DS2250(T) Soft Microcontroller Module FEATURES PIN ASSIGNMENT • 8.
Manufacture Dallas Semiconductor
Datasheet
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DS2250
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DS2250(T)
DS2250(T)
Soft Microcontroller Module
FEATURES
8–bit 8051 compatible microcontroller adapts to task–
at–hand:
– 8K, 32K, or 64K bytes of nonvolatile RAM for
program and/or data memory storage
– Initial downloading of software in end system
via on–chip serial port
– Capable of modifying its own program and/or
data memory in end use
High–reliability operation:
– Maintains all nonvolatile resources for 10 years
in the absence of VCC
– Power–fail reset
– Early warning power–fail interrupt
– Watchdog timer
Software Security Feature:
– Executes encrypted software to prevent unau-
thorized 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
1 20 21
40-PIN SIMM
40
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 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 on–board 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.
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DS2250
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DS2250(T)
ORDERING INFORMATION
PART NUMBER
DS2250–8–16
DS2250–32–16
DS2250–64–16
DS2250T–8–16
DS2250T–32–16
DS2250T–64–16
RAM SIZE
8K bytes
32K bytes
64K bytes
8K bytes
32K bytes
64K bytes
MAX CRYSTAL SPEED
16 MHz
16 MHz
16 MHz
16 MHz
16 MHz
16 MHz
TIMEKEEPING?
No
No
No
Yes
Yes
Yes
Operating information is contained in the User’s Guide section of the Secure Microcontroller Data Book. This data
sheet provides ordering information, pinout, and electrical specifications.
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