ATXMEGA16E5_14 Datasheet, PDF (86/147 Pages) ATMEL Corporation – 8/16-bit Atmel AVR XMEGA Microcontrollers

36.13.4 32 kHz Internal ULP Oscillator Characteristics
Table 36-23. 32 kHz internal ULP oscillator characteristics.
Symbol
Parameter
Output frequency
Accuracy
Condition
Min.
-30
Typ.
32
Max. Units
kHz
30 %
36.13.5 Internal Phase Locked Loop (PLL) Characteristics
Table 36-24. Internal PLL characteristics.
Symbol
f_IN
Parameter
Input frequency
f_OUT
Output frequency ⁽¹⁾
Start-up time
Re-lock time
Condition
Output frequency must be within f_OUT
V_CC= 1.6 - 1.8V
V_CC= 2.7 - 3.6V
Min.
0.4
20
20
Typ.
25
25
Max.
64
48
128
Units
MHz
MHz
µs
µs
Note:
1. The maximum output frequency vs. supply voltage is linear between 1.8V and 2.7V, and can never be higher than four times the maximum CPU frequency.
36.13.6 External Clock Characteristics
Figure 36-3. External clock drive waveform.
t_CH
V_IH1
V_IL1
t_CH
t_CR
t_CL
t_CK
Table 36-25. External clock used as system clock without prescaling.
Symbol Parameter
1/t_CK
Clock Frequency ⁽¹⁾
t_CK
Clock Period
t_CH
Clock High Time
Condition
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
Min.
0
0
83.3
31.5
30.0
12.5
t_CF
Typ.
Max.
12
32
Units
MHz
ns
ns
XMEGA E5 [DATASHEET] 86
Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014