ATmega169P datasheet(19/393 Pages) ATMEL

19 / 393 page

8018N–AVR–08/09

ATmega169P

AVR Memories

This section describes the different memories in the ATmega169P. The AVR architecture has

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

ATmega169P features an EEPROM Memory for data storage. All three memory spaces are lin-

ear and regular.

7.1

In-System Reprogrammable Flash Program Memory

The ATmega169P contains 16K 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 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 ATmega169P

Program 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

279. ”Memory Programming” on page 295 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 16.

Figure 7-1.

Program Memory Map

0x0000

0x1FFF

Program Memory

Application Flash Section

Boot Flash Section

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