Rainbow Electronics ATmega103L - Manual (Page 35)

ATmega603/103
35
Timer/Counter Prescalers
Figure 28. Prescaler for Timer/Counter 1 and Timer/Counter2
For Timer/Counters 1 and 2, the four different prescaled selections are: CK/8, CK/64, CK/256 and CK/1024 where CK is
the CPU clock. Observe that CPU clock frequency can be lower than the XTAL frequency if the XTAL divider is enabled. For
Timer/Counters 1 and 2, added selections as CK, external source and stop, can be selected as clock sources.
Figure 29. The Timer/Counter0 Prescaler
10-BIT T/C PRESCALER
TIMER/COUNTER2 CLOCK SOURCE
TCK2
TIMER/COUNTER1 CLOCK SOURCE
TCK1
CK
T2
T1
CS20 CS10
CS21 CS11
CS22 CS12
CK/8
CK/256
CK/1024
CK/64
0
0
10-BIT T/C PRESCALER
TIMER/COUNTER0 CLOCK SOURCE
PCK0
CK
PCK0
TOSC1
AS0
CS00
CS01
CS02
PCK0/8
PCK0/64
PCK0/128
PCK0/1024
PCK0/256
PCK0/32