DESCRIPTION

The DS5000FP Soft Microprocessor Chip is an 8051-compatible processor based on NV RAM technology. It is substantially more flexible than a standard 8051, yet provides full compatibility with the 8051 instruction set, timers, serial port, and parallel I/O ports. By using NV RAM instead of ROM, the user can program and then reprogram the microcontroller while in-system. The application software can even change its own operation, which allows frequent software upgrades, adaptive programs, customized systems, etc. In addition, by using NV SRAM, the DS5000FP is ideal for data-logging applications and it connects easily to a Dallas real-time clock for time stamp and date.

FEATURES

■ 8051-Compatible Microprocessor Adapts to Its Task

   − Accesses between 8kB and 64kB of nonvolatile SRAM

   − In-system programming via on-chip serial port

   − Can modify its own program or data memory

   − Accesses memory on a separate byte-wide bus

■ Crash-Proof Operation

   − Maintains all nonvolatile resources for over 10 years

   − Power-fail Reset

   − Early Warning Power-fail Interrupt

   − Watchdog Timer

   − User-supplied lithium battery backs user SRAM for program/data storage

■ Software Security

   − Executes encrypted programs to prevent observation

   − Security lock prevents download

   − Unlocking destroys contents

■ Fully 8051 Compatible

   − 128 bytes scratchpad RAM

   − Two timer/counters

   − On-chip serial port

   − 32 parallel I/O port pins