Datasheet

ii
Enter Title of Manual [DATASHEET]
8159E–AVR–02/2013
9.8 Timer/Counter Oscillator ..................................................................................30
9.9 Register Description ........................................................................................31
10 Power Management and Sleep Modes .................................................32
10.1 Sleep Modes ....................................................................................................32
10.2 Idle Mode .........................................................................................................32
10.3 ADC Noise Reduction Mode ............................................................................33
10.4 Power-down Mode ...........................................................................................33
10.5 Power-save Mode ............................................................................................33
10.6 Standby Mode .................................................................................................34
10.7 Minimizing Power Consumption ......................................................................34
10.8 Register Description ........................................................................................35
11 System Control and Reset ..................................................................... 36
11.1 Resetting the AVR ...........................................................................................36
11.2 Reset Sources .................................................................................................36
11.3 Internal Voltage Reference ..............................................................................39
11.4 Watchdog Timer ..............................................................................................40
11.5 Timed Sequences for Changing the Configuration of the Watchdog Timer ....40
11.6 Register Description ........................................................................................42
12 Interrupts .................................................................................................44
12.1 Interrupt Vectors in ATmega8A .......................................................................44
12.2 Register Description ........................................................................................47
13 I/O Ports ..................................................................................................49
13.1 Overview ..........................................................................................................49
13.2 Ports as General Digital I/O .............................................................................50
13.3 Alternate Port Functions ..................................................................................54
13.4 Register Description ........................................................................................62
14 External Interrupts ................................................................................. 64
14.1 Register Description ........................................................................................64
15 8-bit Timer/Counter0 ..............................................................................66
15.1 Features ..........................................................................................................66
15.2 Overview ..........................................................................................................66
15.3 Timer/Counter Clock Sources .........................................................................67
15.4 Counter Unit ....................................................................................................67
15.5 Operation .........................................................................................................67
15.6 Timer/Counter Timing Diagrams ......................................................................68