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PDF ATxmega256A3BU Data sheet ( Hoja de datos )
| Número de pieza | ATxmega256A3BU | |
| Descripción | 8/16-bit Atmel XMEGA A3BUMicrocontroller | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
8/16-bit Atmel XMEGA A3BUMicrocontroller
ATxmega256A3BU
z High-performance, low-power Atmel®AVR®XMEGA® 8/16-bit Microcontroller
z Nonvolatile program and data memories
z 256KBytes of in-system self-programmable flash
z 8KBytes boot section
z 4KBytes EEPROM
z 16KBytes internal SRAM
z Peripheral features
z Four-channel DMA controller
z Eight-channel event system
z Seven 16-bit timer/counters
z Four timer/counters with four output compare or input capture channels
z Three timer/counters with two output compare or input capture channels
z High resolution extension on all timer/counters
z Advanced waveform extension (AWeX) on one timer/counter
z One USB device interface
z USB 2.0 full speed (12Mbps) and low speed (1.5Mbps) device compliant
z 32 Endpoints with full configuration flexibility
z Six USARTs with IrDA support for one USART
z Two two-wire interfaces with dual address match (I2C and SMBus compatible)
z Two serial peripheral interfaces (SPIs)
z AES and DES crypto engine
z CRC-16 (CRC-CCITT) and CRC-32 (IEEE® 802.3) generator
z 32-bit real time counter (RTC) with separate oscillator and battery backup system
z Two sixteen-channel, 12-bit, 2msps Analog to Digital Converters
z One two-channel, 12-bit, 1msps Digital to Analog Converter
z Four Analog Comparators with window compare function, and current sources
z External interrupts on all general purpose I/O pins
z Programmable watchdog timer with separate on-chip ultra low power oscillator
z QTouch® library support
z Capacitive touch buttons, sliders and wheels
z Special microcontroller features
z Power-on reset and programmable brown-out detection
z Internal and external clock options with PLL and prescaler
z Programmable multilevel interrupt controller
z Five sleep modes
z Programming and debug interfaces
z JTAG (IEEE 1149.1 compliant) interface, including boundary scan
z PDI (Program and Debug Interface)
z I/O and packages
z 47 programmable I/O pins
z 64-lead TQFP
z 64-pad QFN
z Operating voltage
z 1.6 – 3.6V
z Operating frequency
z 0 – 12MHz from 1.6V
z 0 – 32MHz from 2.7V
Atmel-8362 G-AVR-ATxmega-07/2014
1 page  
3.1 Block Diagram
Figure 3-1. XMEGA A3BU block diagram.
Digital function
Analog function
Programming, debug, test
Oscillator/Crystal/Clock
General purpose I/O
PA[0..7]
PB[0..7]/
JTAG
PORT A (8)
ACA
ADCA
AREFA
VCC/10
Int. Refs.
Tempref
AREFB
ADCB
ACB
PORT B (8)
DACB
PR[0..1]
XTAL1
XTAL2
PORT R (2)
Event System
Controller
DMA
Controller
DATA BUS
SRAM
BUS Matrix
AES
DES
CRC
CPU
NVM Controller
Flash
Oscillator
Circuits/
Clock
Generation
Oscillator
Control
Sleep
Controller
Prog/Debug
Controller
OCD
Interrupt
Controller
EEPROM
Watchdog
Oscillator
Watchdog
Timer
Power
Supervision
POR/BOD &
RESET
PDI
JTAG
PORT B
USARTF0
TCF0
IRCOM
DATA BUS
EVENT ROUTING NETWORK
Real Time
Counter
Battery Backup
Controller
PORT C (8)
PC[0..7]
PORT D (8)
PD[0..7]
PORT E (6)
32.768 kHz
XOSC
VBAT
Power
Supervision
PE[0..5]
TOSC1
TOSC2
VCC
GND
RESET/
PDI_CLK
PDI_DATA
PF[0..4,6..7]
VBAT
XMEGA A3BU [DATASHEET]
Atmel-8362 G-AVR-ATxmega-07/2014
5
5 Page 
7.3 Flash Program Memory
The Atmel AVR XMEGA devices contain on-chip, in-system reprogrammable flash memory for program storage. The
flash memory can be accessed for read and write from an external programmer through the PDI or from application
software running in the device.
All AVR CPU instructions are 16 or 32 bits wide, and each flash location is 16 bits wide. The flash memory is organized
in two main sections, the application section and the boot loader section. The sizes of the different sections are fixed, but
device-dependent. These two sections have separate lock bits, and can have different levels of protection. The store
program memory (SPM) instruction, which is used to write to the flash from the application software, will only operate
when executed from the boot loader section.
The application section contains an application table section with separate lock settings. This enables safe storage of
nonvolatile data in the program memory.
Figure 7-1. Flash Program Memory (Hexadecimal address).
Word Address
0
1EFFF
1F000
1FFFF
20000
20FFF
Application Section
(256K)
...
Application Table Section
(8K)
Boot Section
(8K)
7.3.1
Application Section
The Application section is the section of the flash that is used for storing the executable application code. The protection
level for the application section can be selected by the boot lock bits for this section. The application section can not store
any boot loader code since the SPM instruction cannot be executed from the application section.
7.3.2
Application Table Section
The application table section is a part of the application section of the flash memory that can be used for storing data.
The size is identical to the boot loader section. The protection level for the application table section can be selected by
the boot lock bits for this section. The possibilities for different protection levels on the application section and the
application table section enable safe parameter storage in the program memory. If this section is not used for data,
application code can reside here.
7.3.3
Boot Loader Section
While the application section is used for storing the application code, the boot loader software must be located in the boot
loader section because the SPM instruction can only initiate programming when executing from this section. The SPM
instruction can access the entire flash, including the boot loader section itself. The protection level for the boot loader
section can be selected by the boot loader lock bits. If this section is not used for boot loader software, application code
can be stored here.
7.3.4
Production Signature Row
The production signature row is a separate memory section for factory programmed data. It contains calibration data for
functions such as oscillators and analog modules. Some of the calibration values will be automatically loaded to the
XMEGA A3BU [DATASHEET]
Atmel-8362 G-AVR-ATxmega-07/2014
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ATxmega256A3BU.PDF ] | |
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