Welcome to AVR Studio 4.19 (09/2011)

Prerequisites: Note that the AVR Studio 4.19 is a complete installation and contains all previous service Packs (SP).

The following new parts have been added to AVR Studio since 4.18 SP3:
-ATtiny84A,ATtiny1634,ATmega3250PA,ATmega325PA,ATmega3290PA,ATXMEGA16A4U,ATXMEGA32A4U,
ATXMEGA64A3U,ATXMEGA128A3U,ATXMEGA192A3U,ATXMEGA256A3U,ATXMEGA256A3BU

The following additional devices are supported by simulator2 in AVR Studio 4.19:
* ATtiny24 / ATtiny24A
* ATtiny44 / ATtiny44A
* ATtiny84 / ATtiny84A
* ATtiny26
* ATmega8 / ATmega8A
* ATmega16 / ATmega16A
* ATmega32 / ATmega32A
* ATmega64 / ATmega64A
* ATmega2560
* ATmega2561
* ATmega640

Bug Fixes 
13075 - avrdragon.exe not able generate .cac file in Windows 7 64 bit
13735 - AVRISPmkII: STK500 command line utility doesn't correctly verify fuses for ELF files
12257 - Only SP1 includes QT600Upgrade, SP2 and SP3 does not include
11109 - ATtiny261/461/861 PINA register does not work correctly
13434 - External interrupt rising flank on tiny2313 triggers on both flanks
13959 - External interrupt rising flank on xmega128a1 triggers on both flanks
12515 - Xmega16D4 is not setting ADC MUX registers
14565 - Wrong PC mask in ATmega32 model
14622 - Timer 0 output compare & overflow interrupts don't work on ATmega64