DS5000FP Soft Microprocessor Chip www.maxim-ic.com FEATURES PIN CONFIGURATION 8051-Compatible Microprocessor Adapts TOP VIEW to Its Task Accesses between 8kB and 64kB of nonvolatile SRAM In-system programming via on-chip serial port 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 Can modify its own program or data P0.4/AD4 1 64 P2.6/A14 2 N.C. 63 N.C. memory 3 N.C. 62 N.C. 4 BA9 61 BD3 Accesses memory on a separate byte-wide 5 P0.3/AD3 60 P2.5/A13 6 BA8 59 BD2 bus 7 P0.2/AD2 58 P2.4/A12 8 57 BA13 BD1 Crash-Proof Operation 9 56 P0.1/AD1 P2.3/A11 10 55 R/W BD0 Maintains all nonvolatile resources for 11 54 P0.0/AD0 V LI 12 53 V GND CC0 over 10 years 13 DS5000FP 52 V GND CC 14 51 V P2.2/A10 CC Power-fail Reset 15 50 P1.0 P2.1/A9 16 49 BA14 P2.0/A8 Early Warning Power-fail Interrupt 17 48 P1.1 XTAL1 18 47 BA12 XTAL2 Watchdog Timer 19 46 P1.2 P3.7/RD 20 45 BA7 P3.6/WR User-supplied lithium battery backs user 21 44 P1.3 P3.5/T1 22 43 N.C. N.C. SRAM for program/data storage 23 42 N.C. N.C. 24 41 BA6 P3.4/T0 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Software Security Executes encrypted programs to prevent observation Security lock prevents download Unlocking destroys contents Fully 8051 Compatible QFP 128 bytes scratchpad RAM Two timer/counters This data sheet must be used in conjunction with the Secure On-chip serial port Microcontroller Users Guide, which contains operating information. This data sheet provides ordering information, pinout, and electrical 32 parallel I/O port pins specifications. Download the Secure Microcontroller Users Guide at www.maxim-ic.com/microcontrollers. ORDERING INFORMATION MAX CLOCK PIN- PART TEMP RANGE SPEED (MHz) PACKAGE DS5000FP-16 0C to +70C 16 80 QFP DS5000FP-16+ 0C to +70C 16 80 QFP + Denotes a Pb-free/RoHS-compliant device. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 22 REV: 070605 P1.4 BA11 BA5 P0.5/AD5 P1.5 CE2 BA4 P0.6/AD6 P1.6 BA10 BA3 P0.7/AD7 P1.7 CE1 N.C. EA BA2 N.C. RST BD7 BA1 ALE P3.0/RXD BD6 BA0 PSEN P3.1/TXD BD5 P3.2/INT0 P2.7/A15 P3.3/INT1 BD4 DS5000FP 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. The DS5000FP provides the benefits of NV RAM without using I/O resources. It uses a nonmultiplexed byte-wide address and data bus for memory access. This bus can perform all memory access and provides decoded chip enables for SRAM. This leaves the 32 I/O port pins free for application use. The DS5000FP uses ordinary SRAM and battery backs the memory contents with a users external lithium cell. Data is maintained for over 10 years with a very small lithium cell. A DS5000FP also provides crash-proof operation in portable systems or systems with unreliable power. These features include the ability to save the operating state, Power-fail Reset, Power-fail Interrupt, and Watchdog Timer. A user loads programs into the DS5000FP via its on-chip Serial Bootstrap Loader. This function supervises the loading of code into NV RAM, validates it, and then becomes transparent to the user. Software can be stored in an 8-kbyte or 32-kbyte CMOS SRAM. Using its internal Partitioning, the DS5000FP will divide this common RAM into user programmable code and data segments. This Partition can be selected at program loading time, but can be modified anytime later. It will decode memory access to the SRAM, communicate via its byte-wide bus and write-protect the memory portion designated as ROM. Combining program and data storage in one device saves board space and cost. The DS5000FP can also access a second 32 kbytes of NV RAM but this area is restricted to data memory. The DS2250(T) and DS5000(T) are available for a user who wants a pre-constructed module using the DS5000FP, RAM, lithium cell, and optional real-time clock. Each device is described in separate data sheets, available on our website at www.maxim-ic.com/microcontrollers. More details are contained in the Secure Microcontroller Users Guide. 2 of 22