Description
The TSC80251G2D products are derivatives of the Atmel Microcontroller family based on the 8/16-bit C251 Architecture. This family of products is tailored to 8/16-bit microcontroller applications requiring an increased instruction throughput, a reduced operating frequency or a larger addressable memory space. The architecture can provide a significant code size reduction when compiling C programs while fully preserving the legacy of C51 assembly routines.

Features
• Pin and Software Compatibility with Standard 80C51 Products and 80C51Fx/Rx/Rx+
• Plug-In Replacement of Intel’s 8xC251Sx
• C251 Core: Intel’s MCS®251 D-step Compliance
• 40-byte Register File
• Registers Accessible as Bytes, Words or Dwords
• Three-stage Instruction Pipeline
• 16-bit Internal Code Fetch
• Enriched C51 Instruction Set
• 16-bit and 32-bit ALU
• Compare and Conditional Jump Instructions
• Expanded Set of Move Instructions
• Linear Addressing
• 1 Kbyte of On-Chip RAM
• External Memory Space (Code/Data) Programmable from 64 kilobytes to 256 kilobytes
• TSC87251G2D: 32 kilobytes of On-Chip EPROM/OTPROM
    – SINGLE PULSE Programming Algorithm
• TSC83251G1D: 16 kilobytes of On-Chip Masked ROM
• TSC83251G1D: 32 kilobytes of On-Chip Masked ROM
• TSC80251G1D: ROMless Version
• Four 8-bit Parallel I/O Ports (Ports 0, 1, 2 and 3 of the Standard 80C51)
• Serial I/O Port: Full Duplex UART (80C51 Compatible) With Independent Baud Rate Generator
• SSLC: Synchronous Serial Link Controller
• TWI Multi-master Protocol
• μWire and SPI Master and Slave Protocols
• Three 16-bit Timers/Counters (Timers 0, 1 and 2 of the Standard 80C51)
• EWC: Event and Waveform Controller
• Compatible with Intel’s Programmable Counter Array (PCA)
• Common 16-bit Timer/Counter Reference with Four Possible Clock Sources (Fosc/4, Fosc/12, Timer 1 and External Input)
• Five Modules, Each with Four Programmable Modes:
    – 16-bit Software Timer/Counter
    – 16-bit Timer/Counter Capture Input and Software Pulse Measurement
    – High-speed Output and 16-bit Software Pulse Width Modulation (PWM)
    – 8-bit Hardware PWM Without Overhead
• 16-bit Watchdog Timer/Counter Capability
• Secure 14-bit Hardware Watchdog Timer
• Power Management
• Power-On Reset (Integrated on the Chip)
• Power-Off Flag (Cold and Warm Resets)
• Software Programmable System Clock
• Idle Mode
• Power-down Mode
• Keyboard Interrupt Interface on Port 1
• Non Maskable Interrupt Input (NMI)
• Real-Time Wait States Inputs (WAIT#/AWAIT#)
• ONCE Mode and Full Speed Real-time In-circuit Emulation Support (Third Party Vendors)
• High Speed Versions:
    – 4.5V to 5.5V
    – 16 MHz and 24 MHz
• Typical Operating Current: 35 mA at 24 MHz 24 mA at 16 MHz
• Typical Power-down Current: 2 μA
• Low Voltage Version:
    – 2.7V to 5.5V
    – 16 MHz
• Typical Operating Current:11 mA at 3V
• Typical Power-down Current: 1 μA
• Temperature Ranges: Commercial (0°C to +70°C), Industrial (-40°C to +85°C)
• Option: Extended Range (-55°C to +125°C)
• Packages: PDIL 40, PLCC 44 and VQFP 44, CDIL 40 and CQPJ 44 with Window
• Options: Known Good Dice and Ceramic Packages

Typical Applications
• ISDN Terminals
• High-Speed Modems
• PABX (SOHO)
• Line Cards
• DVD ROM and Players
• Printers
• Plotters
• Scanners
• Banking Machines
• Barcode Readers
• Smart Cards Readers
• High-End Digital Monitors
• High-End Joysticks
• High-end TV’s