26.5 Maximum Speed versus VCC
Maximum frequency is depending on VCC. As shown in Figure 26-2, the maximum frequency equals 8MHz when VCC is
between 2.7V and 4.5V and equals 16MHz when VCC is between 4.5V and 5.5V.
Figure 26-2. Maximum Frequency versus VCC, ATmega16/32/64/M1/C1
16MHz
8MHz
Safe Operating Area
2.7V
4.5V
5.5V
26.6 PLL Characteristics
Table 26-3. PLL Characteristics - VCC = 2.7V to 5.5V (unless otherwise noted)
Parameter
Symbol
PLLIF
Min.
Typ.
1
Max.
Unit
Input Frequency
PLL Factor
0.5
2
MHz
PLLF
64
Lock-in Time
PLLLT
80
µS
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...)
ATmega16/32/64/M1/C1 [DATASHEET]
277
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
