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The 8xC251SA/SB/SP/SQ has 1 Kbyte or 512 bytes on-chip data RAM and is available with 16 Kbytes or 8 Kbytes of on-chip OTPROM/EPROM (87C251SA/SB/SP/SQ), or ROM (83C251SA/SB/SP/SQ), or ROMless (80C251SB/SQ) options. The 8xC251SA/SB/SP/SQ operates from static standby to 16 MHz clock frequency and is available in 44-pin PLCC, 40-pin PDIP and 40-pin windowed Ceramic DIP package options.
The 8xC251SA/SB/SP/SQ microcontroller is an ideal performance upgrade path for all existing
MCS 51 microcontroller applications. The high performance architecture and the advanced features
available in the 8xC251SA/SB/SP/SQ also make it ideally suited for applications requiring complex data
manipulation functions and real time control capability such as printers, copiers, scanners, CD ROM
drives, tape drives, POS terminals, modems, digital phones, cellular/wireless handsets and linecards.
Intel offers design engineers a variety of hardware and software development tools from some of the industry's leading tools suppliers. High performance, Windows* based software, full featured, real-time emulators along with flexible, fully integrated device programming support is available from many of the familiar suppliers currently supporting the MCS 51 microcontroller architecture. ApBUILDER, Intel's interactive programming software, has been upgraded to include the MCS 251 microcontroller architecture. ApBUILDER speeds up the learning curve and reduces total design time making the migration to the MCS 251 architecture easy. The Project Builder 251 Evaluation Kit brings all the hardware and software needed to begin the project together, in a low cost turn key kit. High performance Windows based development tools are also available from BSO/Tasking, Franklin/Keil and Production Languages Corporation (PLC). These high quality tools include ANSI C Compilers, Macro Assemblers, Source Level Debuggers, Object Librarians, Linker/Locators and Instruction Simulators. Full-featured, real-time emulators featuring DOS* or Windows based user interface and a variety of host hardware interfaces are offered by Metalink Corporation and Nohau Corporation. Flexible, fully integrated device programming support for advanced designs is available from BP Microsystems, Data I/O, Needham, SMS Mikrocomputer-Systeme GmbH, and System General Corporation.
| Package Prefix | ROM Version | EPROM/ OTPRROM Version |
ROMLESS Version | ROM/ EPROM Bytes |
RAM Bytes |
| N, P, C | 83C251SA | 87C251SA | 80C251SB | 8K | 1K |
| N, P, C | 83C251SB | 87C251SB | 80C251SB | 16K | 1K |
| N, P, C | 83C251SP | 87C251SP | 80C251SQ | 8K | 512 |
| N, P, C | 83C251SQ | 87C251SQ | 80C251SQ | 16K | 512 |
Project Builder 251 low cost kits give design engineers all the H/W & S/W tools to fully evaluate the Intel microcontroller features and performance. These turn key kits save you design time and reduce your learning curve by providing tools for every stage of the project design cycle.
The Target Board offers maximum design flexibility to operate as a code development platform as well as a stand alone system to use in your prototype. It was even designed to use Intel's new Boot Block FLASH memory for operation in the stand alone mode.
The Project Builder Kits include a complete Integrated Development Environment commanding a powerful line of systems tools, an environment that includes Project Maintenance and graphical Program Analysis. The kit also includes ApBuilder and the Hypertext 251 User's Manual.
When you are ready to design your Hardware, the kit includes interactive H/W timing models of the Intel Microcontrollers. It's like having a Data Sheet which allows you to perform "what if" timing analysis! Additionally, the Kit includes schematic files and libraries of several Intel 51 & 251 boards with a CAD viewer. Start your design with a working schematic to build on! With Project Builder, you'll be Working Smarter... NOT Harder!
| FEATURES | BENEFITS |
| MCS 251 microcontroller architecture core | High performance - Up to 5 times performance increase using existing 51 code - Up to 15 times performance increase using new 251 instructions Reduced power consumption and RFI Increased efficiency and support for C language programming |
| Binary code and pin compatible with MCS 51 microcontroller |
Easy performance upgrade for all MCS 51 microcontroller applications. Software investment protected Minimal development cost and effort required Quick time to market and quick time to money |
| 256 Kbytes external memory space | Increased capability and flexibility to handle large software requirements |
| 512 bytes or 1 Kbyte on-chip data RAM | Increased internal memory capacity for data manipulation and C language support |
| 8 Kbytes or 16 Kbytes on-chip OTP, ROM or ROMless versions supported |
Flexibility in using different memory options in development and production |
| Programmable Counter Array (PCA) supports - Real-time capture and compare - High speed output - PWM |
Flexibility and performance enhancement in real-time control applications such as: - Measurement of duty cycle, phase difference and frequency - Real-time interrupt generation and output toggling - Adjustable duty cycle generation |
| Hardware watch dog timer | Increased system reliability |
| Page mode configuration | Increases the performance for external instruction fetch by 2X |
| 0 - 3 wait states configuration for external memory access |
Flexibility in external memory and peripheral interface. Allows the use of either fast or slow memory. |
| Support seven interrupt sources, each with four interrupt priority levels |
Increased flexibility for event control applications |
Just use your mouse to touch a bit, flag, register or instruction then hit the "Manual" button and the built-in hypertext link will take you right to the paragraph in the device user's manual. With Intel's hypertext manuals and data sheets its easy to make copies or share them over a network too.
| KEY FEATURES | ||
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Binary-code compatible with MCS 51 microcontrollers
Pin compatible with 44-lead PLCC and 40-lead PDIP
256-Kbyte expanded external code/data memory space
64-Kbyte extended stack space
Pipelined instruction execution unit Minimum 2-clocks instruction execution time |
Seven maskable interrupt sources with four programmable Three flexible 16-bit timer/counters Hardware watchdog timer
Static standby to 16-MHz operation
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