ATXMEGA128A4U-AU Datasheet, PDF (6/121 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA A4U Microcontroller

XMEGA A4U
The Atmel^® AVR^® XMEGA^® devices are supported with a full suite of program and system
development tools including: C compilers, macro assemblers, program debugger/simulators,
programmers, and evaluation kits.
3.1 Block Diagram
Figure 3-1.
XMEGA A4U Block Diagram
Digital function
Analog function
Programming, debug, test
Oscillator/Crystal/Clock
General Purpose I/O
PR[0..1]
XTAL1/
TOSC1
XTAL2/
TOSC2
PORT R (2)
Oscillator
Circuits/
Clock
Generation
Real Time
Counter
Watchdog
Oscillator
PA[0..7]
PB[0..7]
PORT A (8)
ACA
ADCA
AREFA
Int. Refs.
Tempref
AREFB
PORT B (8)
DACB
Event System
Controller
DMA
Controller
DATA BUS
SRAM
BUS Matrix
AES
DES
CRC
CPU
NVM Controller
Oscillator
Control
Sleep
Controller
Prog/Debug
Controller
OCD
Interrupt
Controller
Watchdog
Timer
Power
Supervision
POR/BOD &
RESET
PDI
VCC
GND
RESET/
PDI_CLK
PDI_DATA
Flash
EEPROM
IRCOM
DATA BUS
EVENT ROUTING NETWORK
PORT C (8)
PC[0..7]
PORT D (8)
PD[0..7]
PORT E (4)
TOSC1 (optional)
TOSC2
(optional)
PE[0..3]
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8387A–AVR–07/11