ATMega chip full datasheet - UCSD Department of Physics

ATmega48A/PA/88A/PA/168A/PA/328/P13 External Interrupts ................................................................................. 7213.1Pin Change Interrupt Timing .................................................................................7213.2Register Description ..............................................................................................7314 I/O-Ports .................................................................................................. 7714.1Overview ...............................................................................................................7714.2Ports as General Digital I/O ...................................................................................7814.3Alternate Port Functions ........................................................................................8214.4Register Description ..............................................................................................9415 8-bit Timer/Counter0 with PWM ............................................................ 9615.1Features ................................................................................................................9615.2Overview ...............................................................................................................9615.3Timer/Counter Clock Sources ...............................................................................9815.4Counter Unit ..........................................................................................................9815.5Output Compare Unit ............................................................................................9915.6Compare Match Output Unit ................................................................................10015.7Modes of Operation .............................................................................................10115.8Timer/Counter Timing Diagrams .........................................................................10615.9Register Description ............................................................................................10816 16-bit Timer/Counter1 with PWM ........................................................ 11516.1Features ..............................................................................................................11516.2Overview .............................................................................................................11516.3Accessing 16-bit Registers ..................................................................................11716.4Timer/Counter Clock Sources .............................................................................12016.5Counter Unit ........................................................................................................12116.6Input Capture Unit ...............................................................................................12216.7Output Compare Units .........................................................................................12416.8Compare Match Output Unit ................................................................................12616.9Modes of Operation .............................................................................................12716.10Timer/Counter Timing Diagrams .......................................................................13416.11Register Description ..........................................................................................13617 Timer/Counter0 and Timer/Counter1 Prescalers .............................. 14317.1Internal Clock Source ..........................................................................................14317.2Prescaler Reset ...................................................................................................14317.3External Clock Source .........................................................................................14317.4Register Description ............................................................................................1458271D–AVR–05/11iii