AT90USB1286 datasheet(19/459 Pages) ATMEL

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7593H–AVR–11/08

ATmega32U6/AT90USB64/128

AVR ATmega32U6/AT90USB64/128 Memories

This section describes the different memories in the ATmega32U6/AT90USB64/128. The AVR

architecture has two main memory spaces, the Data Memory and the Program Memory space.

In addition, the ATmega32U6/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 ATmega32U6/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 mem ory has a n e ndu ran ce of at le ast 10 0,00 0 write/erase cycles. Th e

ATmega32U6/AT90USB64/128 Program Counter (PC) is 16 bits wide, thus addressing the

Table 5-1.

Memory Mapping.

Memory

Mnemonic

ATmega32U6

AT90USB64

AT90USB128

Flash

Size

Flash size

32 K bytes

64 K bytes

128K bytes

Start Address

0x00000

End Address

Flash end

0x07FFF(1)

0x3FFF(2)

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

2.5 K bytes

4 K bytes

8 K bytes

Start Address

ISRAM start

0x0100

End Address

ISRAM end

0x0AFF

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

1 K bytes

2 K bytes

4K bytes

Start Address

0x0000

End Address

E2 end

0x03FF

0x07FF

0x0FFF

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