ATmega1284P datasheet(373/380 Pages) ATMEL

373 / 380 page

8059D–AVR–11/09

ATmega1284P

Features ..................................................................................................... 1

Pin Configurations ................................................................................... 2

Overview ................................................................................................... 3

2.1Block Diagram ...........................................................................................................3

2.2Pin Descriptions ........................................................................................................4

Resources ................................................................................................. 6

About Code Examples ............................................................................. 6

AVR CPU Core .......................................................................................... 7

5.1Overview ................................................................................................................... 7

5.2ALU – Arithmetic Logic Unit ......................................................................................8

5.3Status Register ..........................................................................................................8

5.4General Purpose Register File ................................................................................10

5.5Stack Pointer ...........................................................................................................11

5.6Instruction Execution Timing ...................................................................................12

5.7Reset and Interrupt Handling ..................................................................................13

AVR Memories ........................................................................................ 16

6.1Overview .................................................................................................................16

6.2In-System Reprogrammable Flash Program Memory .............................................16

6.3SRAM Data Memory ...............................................................................................17

6.4EEPROM Data Memory ..........................................................................................19

6.5I/O Memory ..............................................................................................................20

6.6Register Description ................................................................................................21

System Clock and Clock Options ......................................................... 27

7.1Clock Systems and their Distribution .......................................................................27

7.2Clock Sources .........................................................................................................28

7.3Low Power Crystal Oscillator ...................................................................................30

7.4Full Swing Crystal Oscillator ....................................................................................31

7.5Low Frequency Crystal Oscillator ............................................................................32

7.6Calibrated Internal RC Oscillator .............................................................................34

7.7128 kHz Internal Oscillator ......................................................................................35

7.8External Clock .........................................................................................................35

7.9Timer/Counter Oscillator .........................................................................................36

7.10Clock Output Buffer ...............................................................................................36

7.11System Clock Prescaler ........................................................................................36

ATmega1284P Datasheet(PDF) 373 Page - ATMEL Corporation