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362
7647F–AVR–04/09
ATmega16/32/64/M1/C1
19
ISRC - Current Source ......................................................................... 258
19.1
Features ........................................................................................................258
19.2
Typical applications .......................................................................................259
19.3
Control Register .............................................................................................261
20
Analog Comparator ............................................................................. 262
20.1
Features ........................................................................................................262
20.2
Overview ........................................................................................................262
20.3
Use of ADC Amplifiers ...................................................................................263
20.4
Analog Comparator Register Description ......................................................264
21
Digital to Analog Converter - DAC ..................................................... 270
21.1
Features ........................................................................................................270
21.2
Operation .......................................................................................................271
21.3
Starting a Conversion ....................................................................................271
21.4
DAC Register Description ..............................................................................272
22
Analog Feature Considerations........................................................... 275
22.1
Purpose .........................................................................................................275
22.2
Use of an Amplifier as Comparator Input ......................................................275
22.3
Use of an Amplifier as Comparator Input and ADC Input ..............................275
22.4
Analog Peripheral Clock Sources ..................................................................276
23
debugWIRE On-chip Debug System .................................................. 277
23.1
Features ........................................................................................................277
23.2
Overview ........................................................................................................277
23.3
Physical Interface ..........................................................................................277
23.4
Software Break Points ...................................................................................278
23.5
Limitations of debugWIRE .............................................................................278
23.6
debugWIRE Related Register in I/O Memory ................................................278
24
Boot Loader Support – Read-While-Write Self-Programming
ATmega16/32/64/M1/C1 ....................................................................... 279
24.1
Boot Loader Features ....................................................................................279
24.2
Application and Boot Loader Flash Sections .................................................279
24.3
Read-While-Write and No Read-While-Write Flash Sections ........................280
24.4
Boot Loader Lock Bits ...................................................................................282
24.5
Entering the Boot Loader Program ................................................................283
24.6
Addressing the Flash During Self-Programming ...........................................285