ATMEGA8_14 Datasheet, PDF (327/331 Pages) ATMEL Corporation – High-performance, Low-power Atmel

2486AA–AVR–02/2013
ATmega8(L)
ADC Noise Reduction Mode 34
Power-down Mode 34
Power-save Mode 34
Standby Mode 35
Minimizing Power Consumption 35
System Control and Reset 37
Internal Voltage Reference 42
Watchdog Timer 43
Timed Sequences for Changing the Configuration of the Watchdog Timer 45
Interrupts 46
Interrupt Vectors in ATmega8 46
I/O Ports 51
Introduction 51
Ports as General Digital I/O 52
Alternate Port Functions 56
Register Description for I/O Ports 65
External Interrupts 66
8-bit Timer/Counter0 69
Overview 69
Timer/Counter Clock Sources 70
Counter Unit 70
Operation 70
Timer/Counter Timing Diagrams 70
8-bit Timer/Counter Register Description 71
Timer/Counter0 and Timer/Counter1 Prescalers 73
16-bit Timer/Counter1 75
Overview 75
Accessing 16-bit Registers 77
Timer/Counter Clock Sources 80
Counter Unit 80
Input Capture Unit 81
Output Compare Units 83
Compare Match Output Unit 85
Modes of Operation 87
Timer/Counter Timing Diagrams 94
16-bit Timer/Counter Register Description 96
8-bit Timer/Counter2 with PWM and Asynchronous Operation 102
Overview 102
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