Expanded Ram Family Product Overview The 8xC51RA/RB/RC provide additional 256 Bytes of random access memory (RAM) space and hardware Watch Dog Timer for increased data parameter handling, high level languages usage and system reliability. They are code and pin compatible with existing MCS® 51 microcontrollers and therefore allow easy upgrade paths to all MCS 51 microcontroller applications. The 8xC51RA/RB/RC bring you all the benefits you would expect from the original innovator of the MCS 51 microcontroller family. Product Description The Intel 8xC51RA/RB/RC belong to the new Expanded RAM microcontroller series based on the MCS 51 microcontroller architecture. The 8xC51RA/RB/RC are code and pin compatible with the existing MCS 51 microcontrollers and therefore are direct `drop-in' replacements to existing MCS 51 microcontroller applications. Products in this Expanded RAM series are: 80C51RA - ROMless + 512B RAM + WDT 83C51RA/87C51RA - 8KB ROM/EPROM + 512B RAM + WDT 83C51RB/87C51RB - 16KB ROM/EPROM + 512B RAM + WDT 83C51RC/87C51RC - 32KB ROM/EPROM + 512B RAM + WDT These products are functionally compatible with the Intel 8xC52/54/58, except for the additional 256 Bytes of on-chip data RAM and hardware WDT. The new microcontrollers are specially designed to accommodate increased data parameter handling and usage of high level languages. The hardware WDT allows for increased system reliability. System development tools support are available from Intel third party tools vendors. Key Features MCS® 51 Microcontroller Compatible Instruction Set Frequency up to 24 MHz operation 8K/16K/32K On-Chip Program Memory 512 Bytes On-Chip Data RAM Hardware Watchdog Timer (one time enabled) 64 KBytes External Program Memory Space 64 KBytes External Data Memory Space Programmable I/O Lines Three 16-Bit Timers/Counters Programmable Clock Out Up/Down Timer/Counter Level Program Lock System Interrupt Sources with 4 Priority Levels Quick Pulse Programming Algorithm Programmable Serial Channel with:   - Framing Error Detection   - Automatic Address Recognition ALE Disable Feature to Reduce EMI Emission Power Saving Idle and Power Down Modes ONCE (On-Circuit Emulation) Mode Available in 44Ld PLCC, 40Ld P-Dip and 44Ld QFP FEATURES BENEFITS Expanded internal RAM (512 byte) size Synergy. More working space on chip, breaks the 256-byte limitation Dedicated hardware watchdog timer (WDT) Control. Improved system integrity control Functionally compatible MCS® 51 microcontrollers Compatibility. Easy migration of existing designs On-Chip peripherals (timer/counter, serial ports, I/O ports, etc.) High Integration. Enables low-cost and low-chip-count designs Support Tools Intel provides hardware and software development tools to support the development of applications based on the 8xC51RA/RB/RC. Tools include in-circuit emulators, assemblers, compilers and programmers. Applications Information The 8xC51RA/RB/RC microcontrollers will make ideal performance upgrade paths for all existing MCS 51 microcontroller applications. The 512 Byte on-chip data RAM available on the 8xC51RA/RB/RC make them suited for applications requiring increased data parameter handling functions and high level languages usage such as CD-ROM drives, scanners, intelligent security systems, wired handsets, analog linecards and etc. MCS® Home

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