单片机读写Flash例子程序和原理图.pdfVIP

Flash Programming Atmel ’s AT29 Flash Family Flash Introduction commodating for their different sector Atmel offers a diverse family of small sizes. sector Flash memory devices ranging in The AT89C51, a member of Atmel ’s density from 256K to 4M bits. These de- growing family of Flash microcontroller vices read and program with a single devices, features 4K bytes of in-system Application voltage supply. The nominal supply volt- reprogrammable Flash memory (see At- age is 5V for the AT29CXXX, 3.3V for mel application note “AT89C51 In-Cir- Note the “low voltage ” AT29LVXXX, and 3V cuit Programming ” for additional infor- for the “Battery Voltage ” AT29BVXXX mation). Current and future versions of (AN-3) Flash memory family. The entire Flash Atmel ’s microcontroller family incorpo- PEROM product line is designed to al- rate from as little as 1K byte of Flash low users to have one common pro- memory to as much as 128K bytes, pro- gramming algorithm for all three Flash viding many density options for different voltage families. Therefore, upgrading applications. Other versions will also in- from one density to another and from a clude special architectures such as a higher voltage to a lower voltage device combination of Flash and parallel is simplified. E2PROM memory on board. This application note describes the de-