ATmega16U4 datasheet(18/408 Pages) ATMEL

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7766D–AVR–01/09

ATmega16U4/ATmega32U4

AVR ATmega16U4/ATmega32U4 Memories

This section describes the different memories in the ATmega16U4/ATmega32U4. The AVR

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

In addition, the ATmega16U4/ATmega32U4 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 ATmega16U4/ATmega32U4 contains 16/32K 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 16K 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

ATmega16U4/ATmega32U4 Program Counter (PC) is 16 bits wide, thus addressing the 32K

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 348.

Table 5-1.

Memory Mapping.

Memory

Mnemonic

ATmega32U4

ATmega16U4

Flash

Size

Flash size

32K bytes

16K bytes

Start Address

0x0000

End Address

Flash end

0x7FFF(1)

0x3FFF(2)

0x3FFF(1)

0x1FFF(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

2,5K bytes

1.25K bytes

Start Address

ISRAM start

0x100

End Address

ISRAM end

0x0AFF

0x05FF

External

Memory

Not Present.

EEPROM

Size

E2 size

1K bytes

512 bytes

End Address

E2 end

0x03FF

0x01FF

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