AT90PWM2/3/2B/3B
7.9
Clock Output Buffer 37
7.10
System Clock Prescaler 37
8
Power Management and Sleep Modes 40
8.1
8.2
8.3
8.4
8.5
8.6
8.7
Sleep Mode Control Register – SMCR 40
Idle Mode 40
ADC Noise Reduction Mode 41
Power-down Mode 41
Standby Mode 41
Power Reduction Register 42
Minimizing Power Consumption 43
9
System Control and Reset 45
9.1
9.2
Internal Voltage Reference 50
Watchdog Timer 50
10 Interrupts 56
10.1
Interrupt Vectors in AT90PWM2/2B/3/3B 56
11 I/O-Ports 61
11.1
11.2
11.3
11.4
Introduction 61
Ports as General Digital I/O 61
Alternate Port Functions 66
Register Description for I/O-Ports 77
12 External Interrupts 80
13 Timer/Counter0 and Timer/Counter1 Prescalers 82
14 8-bit Timer/Counter0 with PWM 85
14.1
14.2
14.3
14.4
14.5
14.6
14.7
14.8
Overview 85
Timer/Counter Clock Sources 86
Counter Unit 86
Output Compare Unit 87
Compare Match Output Unit 89
Modes of Operation 90
Timer/Counter Timing Diagrams 94
8-bit Timer/Counter Register Description 95
15 16-bit Timer/Counter1 with PWM 102
15.1
Overview 102
ii
4317J–AVR–08/10
ATMEL [ ATMEL ]
