PCINT9 datasheet(19/294 Pages) ATMEL

19 / 294 page

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

Atmel AVR Memories

This section describes the different memories in the Atmel

® AVR®. The Atmel AVR architec-

ture has two main memory spaces, the Data memory and the Program memory space. In

addition, the Atmel AVR features an EEPROM Memory for data storage. All three memory

spaces are linear and regular.

Notes:

1. Byte address.

2. Word (16-bit) address.

3.1

In-System Re-programmable Flash Program Memory

The Atmel AVR contains On-chip In-System Reprogrammable Flash memory for program

storage (see “Flash size” in Table 3-1 on page 19). Since all Atmel AVR instructions are 16 or

32 bits wide, the Flash is organized as 16 bits wide. Atmel AVR does not have separate Boot

Loader and Application Program sections, and the SPM instruction can be executed from the

entire Flash. See SELFPRGEN description in Section 21.2.1 “Store Program Memory Control

and Status Register – SPMCSR” on page 230 for more details.

The Flash memory has an endurance of at least 10,000 write/erase cycles in automotive

range. The Atmel AVR Program Counter (PC) address the program memory locations. Sec-

tion 22. “Memory Programming” on page 236 contains a detailed description on Flash data

serial downloading using the SPI pins.

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

LPM – Load Program memory instruction description).

Table 3-1.

Memory Mapping.

Memory

Mnemonic

Atmel AVR

Flash

Size

Flash size

16 K bytes

Start Address

0x0000

End Address

Flash end

0x3FFF(1)

0x1FFF(2)

32 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

512 bytes

Start Address

ISRAM start

0x0100

End Address

ISRAM end

0x02FF

EEPROM

Size

E2 size

512 bytes

Start Address

0x0000

End Address

E2 end

0x01FF

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