Datasheet

10. AVR Memories

10.1 Overview

This section describes the different memory types in the device. The AVR architecture has two main

memory spaces, the Data Memory and the Program Memory space. In addition, the device features an

EEPROM Memory for data storage. All memory spaces are linear and regular.

10.2 In-System Reprogrammable Flash Program Memory

The ATmega328PB contains 32 Kbytes 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.

The ATmega328PB Program Counter (PC) is 14 bits wide, thus addressing the 16K program memory

locations. The operation of the Boot Program section and associated Boot Lock bits for software

protection are described in detail in Boot Loader Support – Read-While-Write Self-Programming. Refer to

Memory Programming for the description of Flash data serial downloading using the SPI pins.

Constant tables can be allocated within the entire program memory address space, using the Load

Program Memory (LPM) instruction.

Timing diagrams for instruction fetch and execution are presented in Instruction Execution Timing.

Figure 10-1. Program Memory Map ATmega328PB

0x0000

0x3FFF

Program Memory

Application Flash Section

Boot Flash Section