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XMEGAA Datasheet(PDF) 7 Page - ATMEL Corporation |
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XMEGAA Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 445 page  7 8077H–AVR–12/09 XMEGA A 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. 3.4 ALU - Arithmetic Logic Unit 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. 3.4.1 Hardware Multiplier 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: • 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. A multiplication takes two CPU clock cycles. 3.5 Program Flow 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. |
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Similar Description - XMEGAA_09 |
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