25 Memory Programming ......................................................................... 246
25.1Program And Data Memory Lock Bits .................................................................246
25.2Fuse Bits ..............................................................................................................247
25.3Signature Bytes ...................................................................................................249
25.4Calibration Byte ...................................................................................................249
25.5Page Size ............................................................................................................249
25.6Parallel Programming Parameters, Pin Mapping, and Commands .....................250
25.7Parallel Programming ..........................................................................................252
25.8Serial Downloading ..............................................................................................259
25.9Serial Programming Pin Mapping ........................................................................259
26 Electrical Characteristics .................................................................... 264
26.1Absolute Maximum Ratings* ...............................................................................264
26.2DC Characteristics ...............................................................................................264
26.3Speed Grades .....................................................................................................266
26.4Clock Characteristics ...........................................................................................266
26.5System and Reset Characteristics ......................................................................267
26.6External Interrupts Characteristics ......................................................................268
26.7SPI Timing Characteristics ..................................................................................269
26.8Hardware Boot EntranceTiming Characteristics ..................................................270
26.9Parallel Programming Characteristics .................................................................270
27 Typical Characteristics ........................................................................ 273
27.1Active Supply Current ..........................................................................................273
27.2Idle Supply Current ..............................................................................................274
27.3Power-down Supply Current ................................................................................275
27.4Pin Pull-Up ...........................................................................................................277
27.5Pin Driver Strength ..............................................................................................278
27.6Pin Threshold and Hysteresis ..............................................................................280
27.7BOD Threshold ....................................................................................................281
27.8Internal Oscilllator Speed ....................................................................................283
27.9Current Consumption of Peripheral Units ............................................................286
27.10Current Consumption in Reset and Reset Pulsewidth ......................................287
28 Register Summary ............................................................................... 288
29 Instruction Set Summary ..................................................................... 292
30 Ordering Information ........................................................................... 294
vi
ATmega8U2/16U2/32U2
7799D–AVR–11/10
ATMEL [ ATMEL ]
