ATMEGA6450-16AI(2004) 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA6450-16AI
(Rev.:2004)

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

JTAG Interface and On-chip Debug System ................................. 210

Overview........................................................................................................... 210

Test Access Port – TAP.................................................................................... 210

TAP Controller .................................................................................................. 212

Using the Boundary-scan Chain ....................................................................... 213

Using the On-chip Debug System .................................................................... 213

On-chip Debug Specific JTAG Instructions ...................................................... 214

On-chip Debug Related Register in I/O Memory .............................................. 215

Using the JTAG Programming Capabilities ...................................................... 215

Bibliography ...................................................................................................... 215

IEEE 1149.1 (JTAG) Boundary-scan .............................................. 216

Features............................................................................................................ 216

System Overview.............................................................................................. 216

Data Registers .................................................................................................. 216

Boundary-scan Specific JTAG Instructions ...................................................... 218

Boundary-scan Related Register in I/O Memory .............................................. 219

Boundary-scan Chain ....................................................................................... 220

ATmega325/3250/645/6450 Boundary-scan Order.......................................... 229

Boundary-scan Description Language Files ..................................................... 241

Boot Loader Support – Read-While-Write Self-Programming ..... 242

Boot Loader Features ....................................................................................... 242

Application and Boot Loader Flash Sections .................................................... 242

Read-While-Write and No Read-While-Write Flash Sections........................... 242

Boot Loader Lock Bits....................................................................................... 244

Entering the Boot Loader Program ................................................................... 245

Addressing the Flash During Self-Programming .............................................. 247

Self-Programming the Flash ............................................................................. 248

Memory Programming..................................................................... 256

Program And Data Memory Lock Bits .............................................................. 256

Fuse Bits........................................................................................................... 257

Signature Bytes ................................................................................................ 259

Calibration Byte ................................................................................................ 259

Parallel Programming Parameters, Pin Mapping, and Commands .................. 259

Serial Programming Pin Mapping ..................................................................... 261

Parallel Programming ....................................................................................... 262

Serial Downloading........................................................................................... 270

Programming via the JTAG Interface ............................................................... 274

Electrical Characteristics................................................................ 286

Absolute Maximum Ratings*............................................................................. 286

DC Characteristics............................................................................................ 286

External Clock Drive Waveforms ...................................................................... 288

External Clock Drive ......................................................................................... 288

iv ATmega325/3250/645/6450

2570A–AVR–09/04

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