Rainbow-electronics ATmega8HVD Manual de usuario descargar pdf (Pagina 163)

8052B–AVR–09/08

ATmega4HVD/8HVD

Table of Contents

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

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

1.1Pin Descriptions .........................................................................................................3

2 Overview ................................................................................................... 4

3 Resources ................................................................................................. 5

4 Data Retention .......................................................................................... 5

5 About Code Examples ............................................................................. 5

6 AVR CPU Core .......................................................................................... 6

6.1Overview ....................................................................................................................6

6.2ALU – Arithmetic Logic Unit .......................................................................................7

6.3Status Register ..........................................................................................................7

6.4General Purpose Register File ..................................................................................9

6.5Stack Pointer ...........................................................................................................10

6.6Instruction Execution Timing ...................................................................................11

6.7Reset and Interrupt Handling ...................................................................................11

7 AVR Memories ........................................................................................ 14

7.1Overview ..................................................................................................................14

7.2In-System Reprogrammable Flash Program Memory .............................................14

7.3SRAM Data Memory ................................................................................................15

7.4EEPROM Data Memory ..........................................................................................16

7.5I/O Memory ..............................................................................................................16

7.6Register Description ................................................................................................17

8 System Clock and Clock Options ......................................................... 22

8.1Clock Systems and their Distribution .......................................................................22

8.2Clock Sources .........................................................................................................23

8.3Calibrated Fast RC Oscillator ..................................................................................23

8.4Slow RC Oscillator ...................................................................................................24

8.5Ultra Low Power RC Oscillator ................................................................................24

8.6CPU, I/O, Flash, and ADC Clock .............................................................................24

8.7Watchdog Timer and Battery Protection ..................................................................24

8.8Clock Startup Sequence ..........................................................................................24

8.9Clock Output ............................................................................................................25

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Rainbow-electronics ATmega8HVD Manual de usuario Pagina 163