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DS5000 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS5000 Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 19 page  DS5000(T) Soft Microcontroller Module DS5000(T) 021998 1/19 FEATURES • 8–bit8051compatibleMicrocontrolleradaptstotask– at–hand: – 8 or 32K 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 • Crashproof 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 and pinout • Optional Permanently Powered Real–Time Clock (DS5000T) PIN ASSIGNMENT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 40–PIN ENCAPSULATED PACKAGE 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST RXD P3.0 TXD P3.1 INT0 P3.2 INT1 P3.3 T0 P3.4 T1 P3.5 WR P3.6 RD P3.7 XTAL2 XTAL1 GND VCC P0.0 AD0 P0.1 AD1 P0.2 AD2 P0.3 AD3 P0.4 AD4 P0.5 AD5 P0.6 AD6 P0.7 AD7 EA ALE PSEN P2.7 A15 P2.6 A14 P2.5 A13 P2.4 A12 P2.3 A11 P2.2 A10 P2.1 A9 P2.0 A8 DESCRIPTION The DS5000(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 either 8K or 32K bytes 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. |
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