5
8331B–AVR–03/12
Atmel AVR XMEGA AU
a feature summary for the XMEGA AU family is shown, split into one fea-
ture summary column for each sub-family. Each sub-family has identical feature set, but different
memory options, refer to their device datasheet for ordering codes and memory options.
Table 2-1.
XMEGA AU feature summary overview.
Feature
Details / sub-family
A1U
A3U
A3BU
A4U
Pins, I/O
Total
100
64
64
44
Programmable I/O pins
78
50
47
34
Memory
Program memory (KB)
64 - 128
64 - 256
256
16 - 128
Boot memory (KB)
4 - 8
4 - 8
8
4 - 8
SRAM (KB)
4 - 8
4 - 16
16
2 - 8
EEPROM
2
2 - 4
4
1 -2
General purpose registers
16
16
16
16
Package
TQFP
100A
64A
64A
44A
QFN /VQFN
–
64M2
64M2
44M1
BGA
100C1/100C2
–
–
49C2
QTouch
Sense channels
56
56
56
56
DMA Controller
Channels
4
4
4
4
Event System
Channels
8
8
8
8
QDEC
3
3
3
3
Crystal Oscillator
0.4 - 16MHz XOSC
Yes
Yes
Yes
Yes
32.768 kHz TOSC
Yes
Yes
Yes
Yes
Internal Oscillator
2MHz calibrated
Yes
Yes
Yes
Yes
32MHz calibrated
Yes
Yes
Yes
Yes
128MHz PLL
Yes
Yes
Yes
Yes
32.768kHz calibrated
Yes
Yes
Yes
Yes
32kHz ULP
Yes
Yes
Yes
Yes
Timer / Counter
TC0 - 16-bit, 4 CC
4
4
4
3
TC1 - 16-bit, 2 CC
4
3
2
2
TC2 - 2x 8-bit
4
4
4
2
Hi-Res
4
4
4
3
AWeX
4
2
2
1
RTC
1
1
1
RTC32
1
Battery Backup System
Yes
