23支持引导装入程序 - 同时读 - 写自编程......... 225

23.1 Boot Loader的特点.............................................. .......................................... 225

23.2应用程序和Boot Loader的Flash区........................................... .......... 225

23.3同时读 - 写和非同时读 - 写Flash区............................ 225

23.4引导程序锁定位............................................. .......................................... 228

23.5进入Boot Loader程序............................................ ........................ 229

23.6中寻址Flash在自编程.......................................... ..... 233

23.7自编程闪存............................................ .................................. 233

24 debugWIRE的片上调试系统........................................... ....... 241

24.1特点............................................................................................................241

24.2概览............................................................................................................241

24.3物理接口............................................... ............................................... 241

24.4软件断点.............................................. ......................................... 242

debugWIRE的24.5局限性.............................................. ................................... 242

24.6 debugWIRE相关的寄存器I / O存储器......................................... ........... 242

25存储器编程............................................... .......................... 243

25.1程序存储器和数据存储器锁定位........................................... .................... 243

25.2熔丝位............................................................................................................244

25.3签名字节............................................... .................................................. 246

25.4校准字节............................................... .................................................. 246

25.5并行编程参数，引脚映射及命令................... 246

25.6并行编程............................................... ......................................... 249

25.7串行下载............................................... ............................................. 257

25.8串行编程引脚映射............................................. ......................... 257

26电气特性............................................... ..................... 262

26.1绝对最大额定值* ............................................. ................................ 262

26.2直流特性............................................... .............................................. 262

26.3外部时钟驱动波形............................................. .......................... 264

26.4外部时钟驱动.............................................. ............................................ 264

26.5最高车速与V

CC ...........................................................................................................................265

26.6 SPI时序特性.............................................. .................................. 265

26.7硬件启动EntranceTiming特点............................................. ... 266

27 AT90USB82 / 162的典型特征 - 初步数据........... 268

27.1的输入电平.............................................. ............................................ 269

27.2输出电压电平.............................................. ......................................... 271

5

AT90USB82/162

7707D–AVR–07/08