Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI 数据表

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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271H-AVR- ATmega-Datasheet_08/2014

This section describes the different memories in the ATmega48A/PA/88A/PA/168A/PA/328/P. The AVR 
architecture has two main memory spaces, the Data Memory and the Program Memory space. In addition, the 
ATmega48A/PA/88A/PA/168A/PA/328/P features an EEPROM Memory for data storage. All three memory 
spaces are linear and regular.

The ATmega48A/PA/88A/PA/168A/PA/328/P contains 4/8/16/32Kbytes 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 
2/4/8/16K x 16. For software security, the Flash Program memory space is divided into two sections, Boot 
Loader Section and Application Program Section in ATmega88PA and ATmega168PA. See SPMEN description 
in section 

 for more details.

The Flash memory has an endurance of at least 10,000 write/erase cycles. The 
ATmega48A/PA/88A/PA/168A/PA/328/P Program Counter (PC) is 11/12/13/14 bits wide, thus addressing the 
2/4/8/16K program memory locations. The operation of Boot Program section and associated Boot Lock bits for 
software protection are described in detail in 

and 

 contains a detailed description 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 instruction description).

Timing diagrams for instruction fetch and execution are presented in