Rainbow Electronics Atmega169L - Manual (Page 311)

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ATmega169V/L
2514A–AVR–08/02
Table of Contents Features................................................................................................. 1
Pin Configurations................................................................................ 2
Disclaimer ............................................................................................................. 2
Overview................................................................................................ 3
Block Diagram ...................................................................................................... 3
Pin Descriptions.................................................................................................... 5
About Code Examples.......................................................................... 6
AVR CPU Core ...................................................................................... 7
Introduction ........................................................................................................... 7
Architectural Overview .......................................................................................... 7
ALU – Arithmetic Logic Unit.................................................................................. 8
Status Register ..................................................................................................... 9
General Purpose Register File ........................................................................... 10
Stack Pointer ...................................................................................................... 11
Instruction Execution Timing............................................................................... 12
Reset and Interrupt Handling .............................................................................. 12
AVR ATmega169 Memories ............................................................... 15
In-System Reprogrammable Flash Program Memory ........................................ 15
SRAM Data Memory........................................................................................... 16
EEPROM Data Memory...................................................................................... 17
I/O Memory ......................................................................................................... 22
System Clock and Clock Options ..................................................... 23
Clock Systems and their Distribution .................................................................. 23
Clock Sources..................................................................................................... 24
Default Clock Source .......................................................................................... 24
Crystal Oscillator................................................................................................. 25
Low-frequency Crystal Oscillator ........................................................................ 26
Calibrated Internal RC Oscillator ........................................................................ 27
External Clock..................................................................................................... 29
Clock Output Buffer ............................................................................................ 29
Timer/Counter Oscillator ..................................................................................... 30
System Clock Prescaler...................................................................................... 30
Power Management and Sleep Modes.............................................. 32
Idle Mode ............................................................................................................ 33
ADC Noise Reduction Mode ............................................................................... 33
Power-down Mode.............................................................................................. 33
Power-save Mode ............................................................................................... 33
Standby Mode..................................................................................................... 34
Minimizing Power Consumption ......................................................................... 34