ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 7

• Manufacturer Part Number: ATXMEGA256A3B-MH
• Description: MCU AVR 256KB FLASH A3B 64-QFN
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3B-MH

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 49
• Number Of Timers: 7
• Operating Supply Voltage: 1.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• On-chip Dac: 12 bit, 2 Channel
• For Use With: ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATXMEGA256A3B-MU; ATXMEGA256A3B-MU

3.4
3.4.1
3.5
8077H–AVR–12/09
ALU - Arithmetic Logic Unit
Program Flow
Hardware Multiplier
The SRAM holds data, and code cannot be executed from here. It can easily be accessed
through the five different addressing modes supported in the AVR architecture. The first SRAM
address is 0x2000.
Data address 0x1000 to 0x1FFF is reserved for memory mapping of EEPROM.
The Program Memory is divided in two sections, the Application Program section and the Boot
Program section. Both sections have dedicated Lock bits for write and read/write protection. The
SPM instruction that is used for self-programming of the Application Flash memory must reside
in the Boot Program section. A third section exists inside the Application section. This section,
the Application Table section, has separate Lock bits for write and read/write protection. The
Application Table section can be used for storing non-volatile data or application software.
The Arithmetic Logic Unit (ALU) supports arithmetic and logic operations between registers or
between a constant and a register. Single register operations can also be executed. The ALU
operates in direct connection with all the 32 general purpose registers. In a typical single cycle
ALU operation, two operands are output from the Register File, the operation is executed, and
the result is stored back in the Register File.
In order to operate on data in the Data Memory, these must first be loaded into the Register File.
After the operation, the data can be stored from the Register File and back to the Data Memory.
The ALU operations are divided into three main categories - arithmetic, logical, and bit-functions.
After an arithmetic or logic operation, the Status Register is updated to reflect information about
the result of the operation.
The multiplier is capable of multiplying two 8-bit numbers into a 16-bit result. The hardware mul-
tiplier supports different variations of signed and unsigned integer and fractional numbers:
A multiplication takes two CPU clock cycles.
After reset, the program will start to execute from program address 0. Program flow is provided
by conditional and unconditional jump and call instructions, able to directly address the whole
address space. Most instructions have a single 16-bit word format. Every program memory
address contains a 16- or 32-bit instruction. The Program Counter (PC) addresses the location
from where instructions are fetched. During interrupts and subroutine calls, the return address
PC is stored on the Stack.
• Multiplication of unsigned integers.
• Multiplication of signed integers.
• Multiplication of a signed integer with an unsigned integer.
• Multiplication of unsigned fractional numbers.
• Multiplication of signed fractional numbers.
• Multiplication of a signed fractional number and with an unsigned.
XMEGA A
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