Datasheet

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86
XMEGA E5 [DATASHEET]
Atmel-8153J–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–11/2014
Table 36-26. External Clock with Prescaler
(1)
for System Clock
Notes: 1. System Clock Prescalers must be set so that maximum CPU clock frequency for device is not exceeded.
2. The maximum frequency vs. supply voltage is linear between 1.6V and 2.7V, and the same applies for all other parameters with supply voltage conditions.
36.13.7 External 16MHz Crystal Oscillator and XOSC Characteristics
Table 36-27. External 16MHz Crystal Oscillator and XOSC Characteristics
Symbol Parameter Condition Min. Typ. Max. Units
1/t
CK
Clock Frequency
(2)
V
CC
= 1.6 - 1.8V 0 90
MHz
V
CC
= 2.7 - 3.6V 0 142
t
CK
Clock Period
V
CC
= 1.6 - 1.8V 11
ns
V
CC
= 2.7 - 3.6V 7
t
CH
Clock High Time
V
CC
= 1.6 - 1.8V 4.5
V
CC
= 2.7 - 3.6V 2.4
t
CL
Clock Low Time
V
CC
= 1.6 - 1.8V 4.5
V
CC
= 2.7 - 3.6V 2.4
t
CR
Rise Time (for maximum frequency)
V
CC
= 1.6 - 1.8V 1.5
V
CC
= 2.7 - 3.6V 1.0
t
CF
Fall Time (for maximum frequency)
V
CC
= 1.6 - 1.8V 1.5
V
CC
= 2.7 - 3.6V 1.0
t
CK
Change in period from one clock cycle to the next 10 %
Symbol Parameter Condition Min. Typ. Max. Units
Cycle to cycle jitter
XOSCPWR=0
FRQRANGE=0 <10
ns
FRQRANGE=1, 2, or 3 <1
XOSCPWR=1 <1
Long term jitter
XOSCPWR=0
FRQRANGE=0 <6
FRQRANGE=1, 2, or 3 <0.5
XOSCPWR=1 <0.5