AT90USB646 datasheet(21/456 Pages) ATMEL

21 / 456 page

7593L–AVR–09/12

AT90USB64/128

software protection are described in detail in “Memory programming” on page 359. “Memory pro-

gramming” on page 359 contains a detailed description on Flash data serial downloading using

the SPI pins or the JTAG 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 16.

Figure 6-1.

Program memory map.

6.2

SRAM data memory

Figure 6-2 shows how the Atmel AT90USB64/128 SRAM memory is organized.

The AT90USB64/128 is a complex microcontroller with more peripheral units than can be sup-

ported within the 64 location reserved in the Opcode for the IN and OUT instructions. For the

Extended I/O space from $060 - $0FF in SRAM, only the ST/STS/STD and LD/LDS/LDD instruc-

tions can be used.

The first 4,352/8,448 Data Memory locations address both the Register File, the I/O Memory,

Extended I/O Memory, and the internal data SRAM. The first 32 locations address the Register

file, the next 64 location the standard I/O Memory, then 160 locations of Extended I/O memory

and the next 4,096/8,192 locations address the internal data SRAM.

0x00000

Program memory

Application flash section

Boot flash section

Flash end

AT90USB646 Datasheet(PDF) 21 Page - ATMEL Corporation