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DS2250-8-16 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS2250-8-16 Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 19 page  DS2250(T) Soft Microcontroller Module DS2250(T) 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 FEATURES • 8–bit8051compatiblemicrocontrolleradaptstotask– 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 40-PIN SIMM 120 21 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. |
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