该代码用于驱动AT29C040AFLASH芯片，该芯片为512K Nor FLASH。单片机使用的是STC89lv58,使用74HC573服用I/O口。-This code is used for read&write AT29c040.This chip is a Nor FLASH which can store 512k data.

CMOS FLASH MEMORY AT29C040 读写程序，用于单片机ROM扩展-The AT29C040A is a 5-volt-only in-system Flash Programmable and Erasable Read Only Memory (PEROM). Its 4 megabits of memory is organized as 524,288 words by 8 bits.