ATmega48 datasheet(334/340 Pages) ATMEL

334 / 340 page

334

7530H–AVR–02/09

ATmega48/88/168 Automotive

6.9

Clock Output Buffer .........................................................................................33

6.10

Timer/Counter Oscillator ..................................................................................33

6.11

System Clock Prescaler ..................................................................................34

Power Management and Sleep Modes ................................................. 36

7.1

Idle Mode .........................................................................................................37

7.2

ADC Noise Reduction Mode ............................................................................37

7.3

Power-down Mode ...........................................................................................37

7.4

Power-save Mode ............................................................................................38

7.5

Standby Mode .................................................................................................38

7.6

Power Reduction Register ...............................................................................39

7.7

Minimizing Power Consumption ......................................................................40

System Control and Reset .................................................................... 41

8.1

Internal Voltage Reference ..............................................................................46

8.2

Watchdog Timer ..............................................................................................47

Interrupts ................................................................................................ 52

9.1

Interrupt Vectors in ATmega48 ........................................................................53

9.2

Interrupt Vectors in ATmega88 ........................................................................54

9.3

Interrupt Vectors in ATmega168 ......................................................................58

I/O-Ports .................................................................................................. 62

10.1

Introduction ......................................................................................................62

10.2

Ports as General Digital I/O .............................................................................63

10.3

Alternate Port Functions ..................................................................................68

10.4

External Interrupts ................................................................................. 81

8-bit Timer/Counter0 with PWM ............................................................ 86

12.1

Overview ..........................................................................................................86

12.2

Timer/Counter Clock Sources .........................................................................87

12.3

Counter Unit ....................................................................................................87

12.4

Output Compare Unit .......................................................................................88

12.5

Compare Match Output Unit ............................................................................90

12.6

Modes of Operation .........................................................................................91

12.7

Timer/Counter Timing Diagrams .....................................................................95

12.8

8-bit Timer/Counter Register Description ........................................................97

ATmega48 Datasheet(PDF) 334 Page - ATMEL Corporation

ATmega48 Datasheet(HTML) 334 Page - ATMEL Corporation

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