Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 164)

8052B–AVR–09/08

ATmega4HVD/8HVD

8.10System Clock Prescaler ........................................................................................25

8.11ADC Clock Prescaler .............................................................................................26

8.12OSI – Oscillator Sampling Interface ......................................................................27

8.13Register Description ..............................................................................................29

9 Power Management and Sleep Modes ................................................. 32

9.1Sleep Modes ............................................................................................................32

9.2Idle Mode .................................................................................................................34

9.3ADC Noise Reduction ..............................................................................................34

9.4Power-save Mode ....................................................................................................34

9.5Power-off Mode .......................................................................................................35

9.6Power Reduction Register .......................................................................................35

9.7Minimizing Power Consumption ..............................................................................35

9.8Register Description ................................................................................................36

10 System Control and Reset .................................................................... 38

10.1Resetting the AVR .................................................................................................38

10.2Reset Sources .......................................................................................................38

10.3External Reset .......................................................................................................40

10.4Watchdog Reset ....................................................................................................40

10.5Black-out Detection ...............................................................................................40

10.6ATmega4HVD/8HVD Start-up Sequence ..............................................................42

10.7Watchdog Timer ....................................................................................................45

10.8Register Description ..............................................................................................48

11 Interrupts ................................................................................................ 51

11.1Interrupt Vectors in ATmega4HVD/8HVD .............................................................51

12 External Interrupt ................................................................................... 53

12.1Register Description ..............................................................................................53

13 High Voltage I/O Ports ........................................................................... 56

13.1High Voltage Ports as General Digital Outputs .....................................................57

13.2Alternate Port Functions ........................................................................................57

13.3Register Description ..............................................................................................60

14 Low Voltage I/O-Ports ............................................................................ 61

14.1Overview ................................................................................................................61

14.2Low Voltage Ports as General Digital I/O ..............................................................62

14.3Alternate Port Functions ........................................................................................66

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Rainbow-electronics ATmega8HVD Manuel d'utilisateur Page 164