AT87251G2D Overview
Key Specifications
Package: PLCC
Mount Type: Surface Mount
Pins: 44
Max Voltage (typical range): 5.5 V
Key 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 TSC83251G2D: 32 kilobytes of On-Chip Masked ROM TSC80251G2D: 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
