ATMEGA32A_1 Datasheet, PDF (346/352 Pages) ATMEL Corporation – 8-bit Microcontroller with 32K Bytes In-System Programmable Flash

8.9 Timer/Counter Oscillator ..................................................................................31
8.10 Register Description ........................................................................................32
9 Power Management and Sleep Modes ................................................. 33
9.1 Sleep Modes ....................................................................................................33
9.2 Idle Mode .........................................................................................................33
9.3 ADC Noise Reduction Mode ............................................................................34
9.4 Power-down Mode ...........................................................................................34
9.5 Power-save Mode ............................................................................................34
9.6 Standby Mode .................................................................................................35
9.7 Extended Standby Mode .................................................................................35
9.8 Minimizing Power Consumption ......................................................................35
9.9 Register Description ........................................................................................36
10 System Control and Reset .................................................................... 38
10.1 Resetting the AVR ...........................................................................................38
10.2 Reset Sources .................................................................................................38
10.3 Internal Voltage Reference ..............................................................................41
10.4 Watchdog Timer ..............................................................................................42
10.5 Register Description ........................................................................................42
11 Interrupts ................................................................................................ 45
11.1 Interrupt Vectors in ATmega32A .....................................................................45
11.2 Register Description ........................................................................................48
12 I/O Ports .................................................................................................. 50
12.1 Overview ..........................................................................................................50
12.2 Ports as General Digital I/O .............................................................................51
12.3 Alternate Port Functions ..................................................................................55
12.4 Register Description ........................................................................................66
13 External Interrupts ................................................................................. 69
13.1 Register Description ........................................................................................69
14 8-bit Timer/Counter0 with PWM ............................................................ 73
14.1 Features ..........................................................................................................73
14.2 Overview ..........................................................................................................73
14.3 Timer/Counter Clock Sources .........................................................................74
14.4 Counter Unit ....................................................................................................74
14.5 Output Compare Unit .......................................................................................75
ii ATmega32A
8155B–AVR–07/09