AT90USB646 datasheet(18/434 Pages) ATMEL

18 / 434 page

7593A–AVR–02/06

AT90USB64/128

5. AVR AT90USB64/128 Memories

This section describes the different memories in the AT90USB64/128. The AVR architecture has

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

AT90USB64/128 features an EEPROM Memory for data storage. All three memory spaces are

linear and regular.

Notes:

1. Byte address.

2. Word (16-bit) address.

5.1

In-System Reprogrammable Flash Program Memory

The AT90USB64/128 contains 128K bytes On-chip In-System Reprogrammable Flash memory

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

64K 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

AT90USB64/128 Program Counter (PC) is 16 bits wide, thus addressing the 128K program

Table 5-1.

Memory Mapping.

Memory

Mnemonic

AT90USB64

AT90USB128

Flash

Size

Flash size

64 K bytes

128K bytes

Start Address

0x00000

End Address

Flash end

0x0FFFF(1)

0x7FFF(2)

0x1FFFF(1)

0xFFFF(2)

Registers

Size

32 bytes

Start Address

0x0000

End Address

0x001F

I/O

Registers

Size

64 bytes

Start Address

0x0020

End Address

0x005F

Ext I/O

Registers

Size

160 bytes

Start Address

0x0060

End Address

0x00FF

Internal

SRAM

Size

ISRAM size

4 K bytes

8 K bytes

Start Address

ISRAM start

0x0100

End Address

ISRAM end

0x10FF

0x20FF

External

Memory

Size

XMem size

0-64 K bytes

Start Address

XMem start

0x1100

0x2100

End Address

XMem end

0xFFFF

EEPROM

Size

E2 size

2 K bytes

4K bytes

Start Address

0x0000

End Address

E2 end

0x07FF

0x0FFF

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