Datasheet

vi
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
25 IEEE 1149.1 (JTAG) Boundary-scan ................................................... 270
25.1Features ..............................................................................................................270
25.2Overview .............................................................................................................270
25.3Data Registers .....................................................................................................271
25.4Boundary-scan Specific JTAG Instructions .........................................................272
25.5Boundary-scan Chain ..........................................................................................273
25.6Atmel ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P Boundary-scan
order 276
25.7Boundary-scan Description Language Files ........................................................278
25.8Register description .............................................................................................279
26 Boot loader support – read-while-write self-programming .............. 280
26.1Features ..............................................................................................................280
26.2Overview .............................................................................................................280
26.3Application and Boot Loader Flash Sections .......................................................280
26.4Read-While-Write and No Read-While-Write Flash Sections ..............................281
26.5Boot Loader Lock Bits .........................................................................................283
26.6Entering the Boot Loader Program ......................................................................284
26.7Addressing the Flash During Self-Programming .................................................285
26.8Self-Programming the Flash ................................................................................286
26.9Register description .............................................................................................296
27 Memory programming ......................................................................... 298
27.1Program And Data Memory Lock Bits .................................................................298
27.2Fuse bits ..............................................................................................................299
27.3Signature Bytes ...................................................................................................301
27.4Calibration byte ...................................................................................................301
27.5Page Size ............................................................................................................301
27.6Parallel Programming Parameters, Pin Mapping, and Commands .....................302
27.7Parallel programming ..........................................................................................304
27.8Serial downloading ..............................................................................................313
27.9Serial Programming Instruction set .....................................................................315
27.10Programming via the JTAG Interface ................................................................317
28 Electrical characteristics ..................................................................... 330
28.1DC Characteristics ..............................................................................................330
28.2Speed grades ......................................................................................................336
28.3Clock characteristics ...........................................................................................337