320
7647H–AVR–03/12
Atmel ATmega16/32/64/M1/C1
26.5 Maximum Speed vs. V
CC
Maximum frequency is depending on V
CC.
As shown in Figure 26-2 , the Maximum Frequency
equals 8MHz when V
CC
is between 2.7V and 4.5V and equals 16MHz when V
CC
is between 4.5V
and 5.5V.
Figure 26-2. Maximum Frequency vs. V
CC
, ATmega16/32/64/M1/C1
26.6 PLL Characteristics
.
Note: While connected to external clock or external oscillator, PLL Input Frequency must be selected to
provide outputs with frequency in accordance with driven parts of the circuit (CPU core, PSC...)
Safe Operating Area
16Mhz
8Mhz
2.7V 5.5V4.5V
Table 26-3. PLL Characteristics - V
CC
= 2.7V to 5.5V (unless otherwise noted)
Symbol Parameter Min. Typ. Max. Units
PLL
IF
Input Frequency 0.5 1 2 MHz
PLL
F
PLL Factor 64
PLL
LT
Lock-in Time 80 µS
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