Datasheet

and TOSC2 are disconnected from Port C. A crystal can then be connected between the TOSC1 and
TOSC2 pins to serve as an independent clock source for Timer/Counter0. The Oscillator is optimized for
use with a 32.768kHz crystal. Applying an external clock source to TOSC1 is not recommended.
For Timer/Counter0, the possible prescaled selections are: clk
T0S
/8, clk
T0S
/32, clk
T0S
/64, clk
T0S
/128,
clk
T0S
/256, and clk
T0S
/1024. Additionally, clk
T0S
as well as 0 (stop) may be selected. Setting the PSR0 bit
in SFIOR resets the prescaler. This allows the user to operate with a predictable prescaler.
21.11. Register Description
Atmel ATmega64A [DATASHEET]
Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015
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