ATmega128
Power-down Mode 46
Power-save Mode 46
Standby Mode 47
Extended Standby Mode 47
Minimizing Power Consumption 48
System Control and Reset 50
Internal Voltage Reference 54
W atchdog Timer 55
Timed Sequences for Changing the Configuration of the W atchdog Timer 58
Interrupts 60
Interrupt Vectors in ATmega128 60
I/O Ports 66
Introduction 66
Ports as General Digital I/O 67
Alternate Port Functions 71
Register Description for I/O Ports 87
External Interrupts 90
8-bit Timer/Counter0 with PWM and Asynchronous Operation 93
Overview 93
Timer/Counter Clock Sources 94
Counter Unit 94
Output Compare Unit 95
Compare Match Output Unit 97
Modes of Operation 98
Timer/Counter Timing Diagrams 102
8-bit Timer/Counter Register Description 104
Asynchronous Operation of the Timer/Counter 107
Timer/Counter Prescaler 110
16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3) 112
Overview 112
Accessing 16-bit Registers 115
Timer/Counter Clock Sources 118
Counter Unit 118
Input Capture Unit 119
Output Compare Units 121
Compare Match Output Unit 123
Modes of Operation 124
Timer/Counter Timing Diagrams 131
16-bit Timer/Counter Register Description 133
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2467X–AVR–06/11
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