25.2概述............................................................................................................269

25.3应用程序和Boot Loader的Flash区........................................... ........... 269

25.4同时读 - 写和非同时读 - 写Flash区............................. 270

25.5引导程序锁定位............................................. ........................................... 272

25.6进入Boot Loader程序............................................ ......................... 273

25.7中寻址Flash在自编程.......................................... ...... 274

25.8自编程闪存............................................ ................................... 275

25.9寄存器说明............................................... ............................................ 283

26存储器编程............................................... .......................... 285

26.1程序存储器和数据存储器锁定位........................................... ..................... 285

26.2熔丝位............................................................................................................286

26.3标识字节..................................................................................................288

26.4校准字节..................................................................................................288

26.5页面大小...........................................................................................................289

26.6并行编程参数，引脚映射及命令.................... 289

26.7并行编程............................................... .......................................... 291

26.8串行下载............................................... ............................................. 298

27电气特性............................................... ..................... 303

27.1绝对最大额定值* ............................................. ................................. 303

27.2直流特性的ATmega48 / 88/168 * ......................................... ..................... 303

27.3速度等级....................................................................................................305

27.4时钟特性............................................... ........................................... 306

27.5系统和复位特性............................................. ........................ 307

27.6 2线串行接口特性........................................... ..................... 308

27.7 SPI时序特性.............................................. ................................... 309

27.8 ADC特性 - 初步数据............................................ ................. 311

27.9并行编程特性.............................................. .................. 312

28典型特性 - 初步数据....................................... 315

28.1有源电源电流.............................................. ........................................... 315

28.2空闲电源电流.............................................. ............................................... 318

的I / O模块28.3电源电流.......................................... ................................. 321

28.4掉电电源电流............................................ .................................. 323

28.5省电电源电流............................................ ................................... 324

28.6待机电流.............................................. ....................................... 324

28.7引脚拉..........................................................................................................325

vi

2545J–AVR–12/06