ATMEGA16M1_1 Datasheet, PDF (359/365 Pages) ATMEL Corporation – 8-bit Microcontroller with 16K/32K/64K Bytes In-System Programmable Flash

7647F–AVR–04/09
ATmega16/32/64/M1/C1
5.10 System Clock Prescaler ..................................................................................37
6 Power Management and Sleep Modes ................................................ 40
6.1 Sleep Mode Control Register ..........................................................................40
6.2 Idle Mode .........................................................................................................41
6.3 ADC Noise Reduction Mode ............................................................................41
6.4 Power-down Mode ...........................................................................................41
6.5 Standby Mode .................................................................................................42
6.6 Power Reduction Register ...............................................................................42
6.7 Minimizing Power Consumption ......................................................................44
7 System Control and Reset .................................................................... 46
7.1 Resetting the AVR ...........................................................................................46
7.2 Reset Sources .................................................................................................46
7.3 Internal Voltage Reference ..............................................................................51
7.4 Watchdog Timer ..............................................................................................52
8 Interrupts ................................................................................................ 57
8.1 Interrupt Vectors in ATmega16/32/64/M1/C1 ..................................................57
9 I/O-Ports .................................................................................................. 62
9.1 Introduction ......................................................................................................62
9.2 Ports as General Digital I/O .............................................................................63
9.3 Alternate Port Functions ..................................................................................67
9.4 Register Description for I/O-Ports ....................................................................80
10 External Interrupts ................................................................................. 82
10.1 Pin Change Interrupt Timing ............................................................................82
10.2 External Interrupt Control Register A – EICRA ................................................83
11 Timer/Counter0 and Timer/Counter1 Prescalers ................................ 87
11.1 Internal Clock Source ......................................................................................87
11.2 Prescaler Reset ...............................................................................................87
11.3 External Clock Source .....................................................................................87
12 8-bit Timer/Counter0 with PWM ............................................................ 90
12.1 Overview ..........................................................................................................90
12.2 Timer/Counter Clock Sources .........................................................................91
12.3 Counter Unit ....................................................................................................91
12.4 Output Compare Unit .......................................................................................92
12.5 Compare Match Output Unit ............................................................................94
359