Rainbow-electronics ATmega64M1 Manual de usuario descargar pdf (Pagina 18)

8209A–AVR–08/09

ATmega16M1/32M1/64M1

8. Memories

8.1 Overview

This section describes the different memories in the ATmega16M1/32M1/64M1. The AVR archi-

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

addition, the ATmega16M1/32M1/64M1 features an EEPROM Memory for data storage. All

three memory spaces are linear and regular.

8.2 In-System Reprogrammable Flash Program Memory

The ATmega16M1/32M1/64M1 contains 16/32/64K 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 16K x 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

ATmega16M1/32M1/64M1 Program Counter (PC) is 14 bits wide, thus addressing the 16K pro-

gram 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 272. “Memory Programming” on page 289 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.

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

ing” on page 15.

Figure 8-1. Program Memory Map

0x0000

0x1FFF/0x3FFF/0x7FF

Program Memory

Application Flash Section

Boot Flash Section

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 342 343

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