AT87C51RB2芯片解密

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以下提供AT87C51RB2单片机基本特征介绍：

　　AT87C51RB2 概述

　　Atmel TS8xC51Rx2 is a high performance CMOS ROM, OTP, EPROM and ROMless< versions of the 80C51 CMOS single chip 8-bit microcontroller.

　　The TS8xC51Rx2 retains all features of the 80C51 with extended ROM/EPROM capacity (16/32/64 Kbytes), 256 bytes of internal RAM, a 7-source , 4-level interrupt system, an on-chip oscilator and three timer/counters.

　　In addition, the TS80C51Rx2 has a Programmable Counter Array, an XRAM of 256 or 768 bytes, a Hardware Watchdog Timer, a more versatile serial channel that facilitates multiprocessor communication (EUART) and an X2 speed improvement mechanism.

　　The fully static design of the TS80C51Rx2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data.

　　The TS80C51Rx2 has 2 software-selectable modes of reduced activity for further reduction in power consumption. In the idle mode the CPU is frozen while the timers, the serial port and the interrupt system are still operating. In the power-down mode the RAM is saved and all other functions are inoperative.

　　AT87C51RB2 特性

　　80C52 Compatible

　　– 8051 pin and instruction compatible

　　– Four 8-bit I/O ports

　　– Three 16-bit timer/counters

　　– 256 bytes scratchpad RAM

　　High-Speed Architecture

　　– 40 MHz @ 5V, 30MHz @ 3V

　　– X2 Speed Improvement capability (6 clocks/machine cycle)

　　– 30 MHz @ 5V, 20 MHz @ 3V (Equivalent to

　　– 60 MHz @ 5V, 40 MHz @ 3V)

　　Dual Data Pointer

　　On-chip ROM/EPROM (16K-bytes, 32K-bytes, 64K-bytes)

　　On-chip eXpanded RAM (XRAM) (256 or 768 bytes)

　　Programmable Clock Out and Up/Down Timer/Counter 2

　　Programmable Counter Array with

　　– High Speed Output,

　　– Compare / Capture,

　　– Pulse Width Modulator,

　　– Watchdog Timer Capabilities

　　Hardware Watchdog Timer (One-time enabled with Reset-Out)

　　2 extra 8-bit I/O ports available on RD2 with high pin count packages

　　Asynchronous port reset

　　Interrupt Structure with

　　– 7 Interrupt sources,

　　– 4 level priority interrupt system

　　Full duplex Enhanced UART

　　– Framing error detection

　　– Automatic address recognition

　　Low EMI (inhibit ALE)

　　Power Control modes

　　– Idle mode

　　– Power-down mode

　　– Power-off Flag

　　Once mode (On-chip Emulation)

　　Power supply: 4.5-5V, 2.7-5.5V

　　Temperature ranges: Commercial (0 to 70oC) and Industrial (-40 to 85oC)