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One of the these address pointers can also be used as an AT90USB64 pointer for look up tables in Flash program memory. These added function registers are the bit X- Y- and Z-register, described later in this section.


The ALU supports arithmetic and logic operations between registers or between a constant and a register. Single register operations can also be executed in the ALU. After an arithmetic opera- tion, the AT90USB64 Register is updated to reflect information about the result of the operation. Program flow is provided by conditional and unconditional jump and call instructions, able to directly address the whole address space. Most AVR instructions have a single bit word for- mat. Every program memory address contains a or bit instruction. Program Flash memory space is divided in AT90USB64 sections, the Boot Program section and the Application Program section. During interrupts and subroutine calls, the return address Program Counter PC is stored on the Stack.

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All user programs must initialize the SP in the Reset routine before subroutines or interrupts are executed. The memory spaces in the AVR architecture are all linear and regular AT90USB64 maps.

Atmel AVR Programmer

All interrupts have a separate Interrupt Vector in the Interrupt Vector table. The interrupts have priority in accordance with their Interrupt Vector posi- tion. The lower the Interrupt Vector address, the higher the priority. Within a single clock cycle, arithmetic operations between general purpose registers or between a register and an immediate are executed. The ALU operations are divided into three main categories — arithmetic, logical, and bit-functions. This information can be used for altering program flow in order to perform conditional operations.

This will in many cases remove the need for using the dedicated compare instructions, resulting in faster and more compact code. The Status Register is not automatically AT90USB64 when entering an interrupt routine and restored when returning from an interrupt. This must be handled by software. The individual inter- rupt enable control is then performed in separate control registers. If the Global Interrupt Enable Register is cleared, none of the interrupts are enabled independent of the individual interrupt enable settings.

The I-bit is cleared by hardware after an interrupt has occurred, and is set by the RETI instruction to enable subsequent interrupts. The I-bit can also be set and cleared by the application with the SEI and CLI instructions, as described in the instruction set reference. As shown in Figureeach register is also assigned a data memory address, mapping them directly into the first 32 locations of the user Data Space.


Although not being physically imple- mented as SRAM locations, this memory organization provides great flexibility in access of the registers, as the X- Y- and Z-pointer registers can be set to index any register in the file. R31 have some added functions to their general purpose usage. These reg- isters are bit address pointers for indirect addressing of the data space. The three indirect address registers X, Y, and Z are AT90USB64 as described in Figure The Stack Pointer Register always points to the top of the Stack. The internal USB engine remains in suspend mode but the USB differential receiver is still enabled and generates a typical ?

A extra-power consumption. Detection of the suspend state after the transient perturbation should be performed by software instead of reading the SUSPI bit. Thus if VBUS is lower than 4. When measured on a long period, the average signal rate value complies with the specifications. This bit rate deviation does not generates communication or functional errors.

High current consumption in sleep mode If a pending interrupt cannot wake the part up from the selected mode, AT90USB64 current consumption will increase during sleep when executing the SLEEP instruction directly after a SEI instruction. Asynchronous timer interrupt wake up from sleep generates multiple interrupts If the CPU core is in sleep and wakes-up from an asynchronous timer interrupt and then go back in sleep again it may wake up multiple times. Async timer interrupt wake up from sleep generate multiple interrupts 6.


Async timer interrupt wake up from sleep generate multiple interrupts4 4. Asynchronous timer interrupt wake up from sleep generates multiple interrupts If the CPU core is in sleep mode and wakes-up from an asynchronous timer interrupt and then goes back into sleep mode, it may wake up multiple times. Async timer interrupt wake AT90USB64 from sleep generate multiple interrupts 5. The referring revision in this section are referring to the document revision. Changed default configuration for fuse bytes and security byte. Suppression of timer 4,5 registers which does not exist. Updated typical application schematics in AT90USB64 section Updated PLL Prescaler table: The letters stand for: W resides in flash in most cases. 3. L–AVR–09/ AT90USB64/ 1.

Pin configurations. Figure Pinout Atmel AT90USB64/TQFP. AT90USB/ TQFP Microcontroller with 64/K Bytes of ISP Flash and USB Controller. 8-bit Microcontroller with 64/K Bytes of AT90USB64 Flash and USB Controller. 8-bit Atmel Microcontroller with 64/Kbytes of ISP Flash and USB Controller.

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