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AT90USB82

8-bit Microcontroller with 8/16K Bytes of ISP Flash and USB Controller

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5. AVR AT90USB82/162 Memories

This section describes the different memories in the AT90USB82/162. The AVR architecture has

two main memory spaces, the Data Memory and the Program Memory space. In addition, the

AT90USB82/162 features an EEPROM Memory for data storage. All three memory spaces are

linear and regular.

5.1 In-System Reprogrammable Flash Program Memory

The AT90USB82/162 contains 8K / 16K bytes On-chip In-System Reprogrammable Flash mem-

ory for program storage. Since all AVR instructions are 16 or 32 bits wide, the Flash is organized

as 4K x 16, 8K x 16. For software security, the Flash Program memory space is divided into two

sections, Boot Program section and Application Program section.

The Flash memory has an endurance of at least 100,000 write/erase cycles. The

AT90USB82/162 Program Counter (PC) is 16 bits wide, thus addressing the 8K / 16K program

memory locations. The operation of Boot Program section and associated Boot Lock bits for

software protection are described in detail in “Memory Programming” on page 243. “Memory

Programming” on page 243 contains a detailed description on Flash data serial downloading

using the SPI pins or the debugWIRE interface.

Constant tables can be allocated within the entire program memory address space (see the LPM

– Load Program Memory instruction description and ELPM - Extended Load Program Memory

instruction description).

Timing diagrams for instruction fetch and execution are presented in “Instruction Execution Tim-

ing” on page 12.

16 AT90USB82/162

7707F–AVR–11/10

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