ATmega328P datasheet(16/345 Pages) ATMEL

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7810A–AVR–11/09

ATmega328P [Preliminary]

AVR Memories

7.1

Overview

This section describes the different memories in the ATmega328P. The AVR architecture has

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

ATmega328P features an EEPROM Memory for data storage. All three memory spaces are lin-

ear and regular.

7.2

In-System Reprogrammable Flash Program Memory

The ATmega328P contains 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 Loader Section and Application Program Section in ATmega328P. See SELFPRGEN

description in section “SPMCSR – Store Program Memory Control and Status Register” on page

269 and page 284for more details.

The Flash memory has an endurance of at least 10,000 write/erase cycles. The ATmega328P

Program Counter (PC) is 14 bits wide, thus addressing the 16K program memory locations. The

operation of Boot Program section and associated Boot Lock bits for software protection are

described in detail in “Self-Programming the Flash, ATmega328P” on page 263 and “Boot

Loader Support – Read-While-Write Self-Programming, ATmega88P, ATmega168P and

ATmega328P” on page 271. “Memory Programming” on page 286 contains a detailed descrip-

tion on Flash Programming in SPI- or Parallel Programming mode.

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 13.

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