Timer frequency can be calculated for the given crystal frequency by using the below formula
Freq_time=( Freq_cryst/(4*prescalar *resolution))
To calculate the Lowest frequency we need to consider the maximum prescalar which is 1:8 and value of resolution is 65536 since Timer1 is 16 bit and given that Freq_cryst=10 MHz
By substituting in the above formula
Freq_timer = (10000000)/(4 * 8 * 65536)
= 4.76 Hz
This is the lowest frequency that can be generated using Timer1 for the given crystal frequency of 10 Hz
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