读写器与射频卡通信的设计采用RC522射频读写芯片与射频卡进行通信，符合ISO14443规范协议；硬件系统设计中主要有AVR单片机主控模块、电源模块、存储模块、外部时钟模块、LCD模块；软件系统设计采用C语言，遵循模块化和结构化编程模式，设计了射频卡操作程序、软关机与自动关机程序、LCD显示、串行Flash存储器、外部时钟等外部设备驱动程序。所设计的手持式读写器具备对MF1 S50、S70射频卡的读写、实时状态显示、系统在线升级以及关机等功能。-This handset can process

ATMEGA8-lcdd在flash 存贮中应用-学习AVR的朋友们挺多的，但对于一初学者来说不知从何入手，不妨参考下我的教学代码。这是第一次接触时用的。-ATMEGA8-lcdd application in flash memory- learning挺多friends AVR' s, but I do not know where to start for a beginner, may wish to refer to the following code to my teachi

some sample for avr lcd / flash /. mmc / with iar compiler-some sample for avr lcd/flash /. mmc/with iar compiler

This example shows how external devices such as external SRAM and FLASH, and peripherals such as LCD-display, A/D, and D/A can be access with the External Memory Interface. To enable the External Memory Interface, the SRE bit must be se