ATmega16 datasheet(16/357 Pages) ATMEL

16 / 357 page

2466S–AVR–05/09

ATmega16(L)

AVR ATmega16

Memories

This section describes the different memories in the ATmega16. The AVR architecture has two

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

ATmega16 features an EEPROM Memory for data storage. All three memory spaces are linear

and regular.

In-System

Reprogrammable

Flash Program

Memory

The ATmega16 contains 16K bytes On-chip In-System Reprogrammable Flash memory for pro-

gram storage. Since all AVR instructions are 16 or 32 bits wide, the Flash is organized as 8K 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 ATmega16 Pro-

gram Counter (PC) is 13 bits wide, thus addressing the 8K 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

246. “Memory Programming” on page 259 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 13.

Figure 8. Program Memory Map

$0000

$1FFF

Application Flash Section

Boot Flash Section

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