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My Notes On The Atmel 8-bit AVR ATmega168 Microcontroller
Timers And Interrupts On The ATMEGA168 Microcontroller
There are three timers available to you on the ATmega168. There is one 16-bit timer, called Counter 1 and two 8-bit timers called Counter 0 and Counter 2. The 16-bit timer can count up from 0 to 65,535 (Which in Binary is 11111111 11111111). The 8-bit timers can only count up from 0 to 255 (Which in Binary is 11111111).