ADVANCE INFORMATION
8xC251TA/TB/TP/TQ
HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Commercial/Express
■ Real-time and Programmed Wait State
■ User-selectable Configurations:
Bus Operation
— External Wait States (0-3 wait
states)
— Address Range & Memory Mapping
— Page Mode
— Extended Data Float Timings or
8xC251Sx Compatible AC Timings
®
■ Binary-code Compatible with MCS 51
■ Pin Compatible with 44-pin PLCC and
40-pin PDIP MCS 51 Sockets
®
■ Register-based MCS 251 Architecture
— 40-byte Register File
— Registers Accessible as Bytes,
Words, or Double Words
■ 32 Programmable I/O Lines
■ Eight Maskable Interrupt Sources with
Four Programmable Priority Levels
■ Enriched MCS 51 Instruction Set
■ Three Flexible 16-bit Timer/counters
■ Hardware Watchdog Timer
— 16-bit and 32-bit Arithmetic and
Logic Instructions
— Compare and Conditional Jump
Instructions
— Expanded Set of Move Instructions
■ Programmable Counter Array
— High-speed Output
— Compare/Capture Operation
— Pulse Width Modulator
— Watchdog Timer
■ Linear Addressing
■ 256-Kbyte Expanded External
Code/Data Memory Space
■ Two Programmable Serial I/O Ports
— Framing Error Detection
■ ROM Options:
16 Kbytes (TB/TQ), 8 Kbytes (TA/TP), or
without ROM
— Automatic Address Recognition
■ High-performance CHMOS Technology
■ Static Standby to 24-MHz Operation
■ 16-bit Internal Code Fetch
■ 64-Kbyte Extended Stack Space
■ Complete System Development
■ On-chip Data RAM Options:
Support
1-Kbyte (TA/TB) or 512-Byte (TP/TQ)
— Compatible with Existing Tools
■ 8-bit, 2-clock External Code Fetch in
— MCS 251 Tools Available:
Compiler, Assembler, Debugger,
ICE
Page Mode
■ Fast MCS 251 Instruction Pipeline
■ Package Options (PDIP and PLCC)
© INTEL CORPORATION, 1997
November, 1997
Order Number: 273129-001