ATmega1284P datasheet(16/380 Pages) ATMEL

16 / 380 page

8059D–AVR–11/09

ATmega1284P

AVR Memories

6.1

Overview

This section describes the different memories in the ATmega1284P. The AVR architecture has

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

ATmega1284P features an EEPROM Memory for data storage. All three memory spaces are lin-

ear and regular.

6.2

In-System Reprogrammable Flash Program Memory

The ATmega1284P contains 128K 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

64 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 ATmega1284P

Program Counter (PC) is 16 bits wide, thus addressing the 64K 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 291. ”Memory Programming” on page

291 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 12.

ATmega1284P Datasheet(PDF) 16 Page - ATMEL Corporation