21.7
21.8
21.9
ADC Conversion Result 244
ADC Register Description 246
Amplifier 251
21.10 Amplifier Control Registers 255
22 Digital to Analog Converter - DAC 258
22.1
22.2
22.3
22.4
Features 258
Operation 259
Starting a Conversion 259
DAC Register Description 260
23 debugWIRE On-chip Debug System 263
23.1
23.2
23.3
23.4
23.5
23.6
Features 263
Overview 263
Physical Interface 263
Software Break Points 264
Limitations of debugWIRE 264
debugWIRE Related Register in I/O Memory 264
24 Boot Loader Support – Read-While-Write Self-Programming 264
24.1
24.2
24.3
24.4
24.5
24.6
24.7
Boot Loader Features 265
Application and Boot Loader Flash Sections 265
Read-While-Write and No Read-While-Write Flash Sections 265
Boot Loader Lock Bits 268
Entering the Boot Loader Program 269
Addressing the Flash During Self-Programming 271
Self-Programming the Flash 272
25 Memory Programming 278
25.1
25.2
25.3
25.4
25.5
25.6
25.7
25.8
25.9
Program And Data Memory Lock Bits 278
Fuse Bits 280
PSC Output Behaviour During Reset 280
Signature Bytes 282
Calibration Byte 282
Parallel Programming Parameters, Pin Mapping, and Commands 282
Serial Programming Pin Mapping 284
Parallel Programming 285
Serial Downloading 293
v
AT90PWM2/3/2B/3B
4317J–AVR–08/10
ATMEL [ ATMEL ]
