ATtiny25 datasheet(192/196 Pages) ATMEL

192 / 196 page

192

7598H–AVR–07/09

ATtiny25/45/85

Power Management and Sleep Modes ................................................. 31

7.1

MCU Control Register – MCUCR ....................................................................31

7.2

Idle Mode .........................................................................................................32

7.3

ADC Noise Reduction Mode ............................................................................32

7.4

Power-down Mode ...........................................................................................32

7.5

Limitations .......................................................................................................33

7.6

Power Reduction Register ...............................................................................33

7.7

Minimizing Power Consumption ......................................................................34

System Control and Reset .................................................................... 35

8.1

Resetting the AVR ...........................................................................................35

8.2

Reset Sources .................................................................................................35

8.3

Power-on Reset ...............................................................................................36

8.4

External Reset .................................................................................................37

8.5

Brown-out Detection ........................................................................................38

8.6

Watchdog Reset ..............................................................................................39

8.7

MCU Status Register – MCUSR ......................................................................40

8.8

Internal Voltage Reference ..............................................................................40

8.9

Watchdog Timer ..............................................................................................41

8.10

Timed Sequences for Changing the Configuration of the Watchdog Timer ....44

Interrupts ................................................................................................ 45

9.1

Interrupt Vectors in ATtiny25/45/85 .................................................................45

I/O Ports .................................................................................................. 46

10.1

Introduction ......................................................................................................46

10.2

Ports as General Digital I/O .............................................................................47

10.3

Alternate Port Functions ..................................................................................52

10.4

External Interrupts ................................................................................. 58

11.1

MCU Control Register – MCUCR ....................................................................59

11.2

General Interrupt Mask Register – GIMSK ......................................................59

11.3

General Interrupt Flag Register – GIFR ..........................................................60

11.4

Pin Change Mask Register – PCMSK .............................................................60

8-bit Timer/Counter0 with PWM ............................................................ 61

12.1

Overview ..........................................................................................................61

12.2

Timer/Counter Clock Sources .........................................................................62

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