© INTEL CORPORATION December 2003 Order Number: 273129-002
8xC251TB/TQ
HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Commercial/Express
■ Real-t ime and Programmed W ait S ta te
Bus Operation
■ Binary-code Compatible with MCS
®
51
■ Pin Compatible with 44-pin PLCC and
40-pin PDI P MCS
51 Sockets
■ Register -based MCS
®
251 Architecture
— 40-byte Register File
— Registers Accessible as Bytes,
Words, or Double Words
■ Enriched MCS 51 Instruction Set
— 16-bit and 32- bit Arithmetic and
Logic Inst ructions
— Comp are and Conditional Jum p
Instructions
— Expanded Set of Move Instructions
■ Linear Addre ssing
■ 256-Kbyte Expanded External
Code/Data Memory Space
■ ROM Options:
16 Kbytes or without ROM
■ 16-bit Int ernal Code Fetch
■ 64-Kbyte Extended Stack Space
■ On-chip Dat a RAM Opti ons:
512-Byte
■ 8-bit , 2-c lock External Code Fetch in
Page Mode
■ Fast MCS 251 Instr ucti on Pipeline
■ User-selectable Configurations:
— External Wait States (0- 3 wait
stat es)
— Address Range & Memory Mapping
— Page Mode
— Extended Data Float Timings or
8xC251Sx Com patible AC Timings
■ 32 Program mab le I /O Lines
■ Eight Maskable Interrupt Sources with
Four Programmable Priority Levels
■ Three Flexible 16-bit Timer/counters
■ Hardware Watchdog Timer
■ Programmable Counter Array
— High-speed Output
— Compare/Capture Oper ati o n
— Pulse Width Modulator
— W atchdog Timer
■ Two Pr ogram mable Serial I/O Ports
— Framing Error Det ection
— Automatic Address Recognition
■ High-per for ma nce CHMOS Technol ogy
■ Static Stand by to 24- MHz Operation
■ Complete Syste m Developm ent
Support
— Comp atible with Existing Tools
— MCS 251 Tool s Available: Compiler,
Assembler, Debugger, ICE
■ Package Options (PDIP and PLCC)