The DS5000FP is the original Secure Microprocessor chip in an 80-pin QFP. Based on nonvolatile RAM rather than ROM, it offers programming flexibility not possible with ordinary 8051s.
The program and data resources can be partitioned and managed by the user during and after installation. This facilitates frequent software upgrades, adaptive programs, customized systems, etc.
Different versions provide for memory space of 8, 32, or 64kbytes of NV CMOS SRAM. With a user-supplied lithium battery, the on-chip power management circuitry can maintain all nonvolatile resources for greater than 10 years in the absence of external power. A DS5000FP also provides crashproof operation in portable systems by saving the operating state and providing a power-fail reset, power-fail interrupt, and watchdog timer.
Optional security features include real-time memory encryption using a 48-bit user-selected encryption key and a security lock that over-writes memory if it is disturbed. The DS5000FP uses dummy cycles on the memory bus to foil pattern detection. The interrupt vector table is hidden on-chip.
The DS5000FP is ideal for any 8051-type application that requires versatile programming, reliability, and portability, such as data logging and battery-powered applications. It connects easily to a Dallas real-time clock for obtaining time-and date-stamped transactions. Note: Designers must have the following documents to fully use all the features of this device. This data sheet contains pin descriptions, feature overviews, and electrical specifications. Errata sheets contain deviations from published specifications. The user's guides offer detailed information about device features and operation.