ATMEGA329 データシートの表示（PDF） - Atmel Corporation

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ATMEGA329

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

8. AVR ATmega329/3290/649/6490 Memories

This section describes the different memories in the ATmega329/3290/649/6490. The AVR

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

In addition, the ATmega329/3290/649/6490 features an EEPROM Memory for data storage. All

three memory spaces are linear.

8.1 In-System Reprogrammable Flash Program Memory

The ATmega329/3290/649/6490 contains 32/64K 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 16/32K 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 10,000 write/erase cycles. The

ATmega329/3290/649/6490 Program Counter (PC) is 14/15 bits wide, thus addressing the

16/32K program memory locations. The operation of Boot Program section and associated Boot

Lock bits for software protection are described in detail in “Boot Loader Support – Read-While-

Write Self-Programming” on page 278. “Memory Programming” on page 293 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).

Timing diagrams for instruction fetch and execution are presented in “Instruction Execution Tim-

ing” on page 15.

Figure 8-1. Program Memory Map

Program Memory

0x0000

Application Flash Section

Boot Flash Section

0x3FFF/0x7FFF

18 ATmega329/3290/649/6490

2552J–AVR–08/07

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