ATmega165 datasheet(334/336 Pages) ATMEL

334 / 336 page

ATmega165/V

2573G–AVR–07/09

TAP Controller .................................................................................................. 208

Using the Boundary-scan Chain ....................................................................... 209

Using the On-chip Debug System .................................................................... 209

On-chip Debug Specific JTAG Instructions ...................................................... 210

On-chip Debug Related Register in I/O Memory .............................................. 211

Using the JTAG Programming Capabilities ...................................................... 211

Bibliography ...................................................................................................... 211

IEEE 1149.1 (JTAG) Boundary-scan .............................................. 212

Features............................................................................................................ 212

System Overview.............................................................................................. 212

Data Registers .................................................................................................. 212

Boundary-scan Specific JTAG Instructions ...................................................... 214

Boundary-scan Related Register in I/O Memory .............................................. 215

Boundary-scan Chain ....................................................................................... 216

ATmega165 Boundary-scan Order................................................................... 226

Boundary-scan Description Language Files ..................................................... 231

Boot Loader Support – Read-While-Write Self-Programming ..... 232

Boot Loader Features ....................................................................................... 232

Application and Boot Loader Flash Sections .................................................... 232

Read-While-Write and No Read-While-Write Flash Sections........................... 232

Boot Loader Lock Bits....................................................................................... 235

Entering the Boot Loader Program ................................................................... 236

Addressing the Flash During Self-Programming .............................................. 238

Self-Programming the Flash ............................................................................. 239

Memory Programming..................................................................... 246

Program And Data Memory Lock Bits .............................................................. 246

Fuse Bits........................................................................................................... 247

Signature Bytes ................................................................................................ 249

Calibration Byte ................................................................................................ 249

Page Size ......................................................................................................... 249

Parallel Programming Parameters, Pin Mapping, and Commands .................. 249

Serial Programming Pin Mapping ..................................................................... 251

Parallel Programming ....................................................................................... 252

Serial Downloading........................................................................................... 261

Programming via the JTAG Interface ............................................................... 266

Electrical Characteristics................................................................ 279

Absolute Maximum Ratings*............................................................................. 279

DC Characteristics............................................................................................ 279

External Clock Drive Waveforms ...................................................................... 281

External Clock Drive ......................................................................................... 281

Maximum speed vs. V

CC ......................................................................................................................... 281

SPI Timing Characteristics ............................................................................... 282

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