ATXMEGA16E5_14 Datasheet, PDF (87/147 Pages) ATMEL Corporation – 8/16-bit Atmel AVR XMEGA Microcontrollers

Symbol Parameter
Condition
Min.
Typ.
Max. Units
t_CL
Clock Low Time
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
t_CR
Rise Time (for maximum frequency)
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
t_CF
Fall Time (for maximum frequency)
V_CC = 1.6 - 1.8V
V_CC = 2.7 - 3.6V
Δt_CK Change in period from one clock cycle to the next
30.0
12.5
ns
10
ns
3
10
ns
3
10
%
Note:
1. 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.
Table 36-26. External clock with prescaler ⁽¹⁾for system clock.
Symbol
1/t_CK
t_CK
t_CH
t_CL
t_CR
t_CF
Δt_CK
Parameter
Clock Frequency ⁽²⁾
Clock Period
Clock High Time
Clock Low Time
Rise Time (for maximum frequency)
Fall Time (for maximum frequency)
Change in period from one clock cycle to the next
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
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
11
7
4.5
2.4
4.5
2.4
Typ.
Max.
90
142
Units
MHz
ns
ns
ns
1.5
ns
1.0
1.5
ns
1.0
10
%
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
Cycle to cycle jitter
Condition
XOSCPWR=0
XOSCPWR=1
FRQRANGE=0
FRQRANGE=1, 2, or 3
Min.
Typ.
<10
<1
<1
Max.
Units
ns
XMEGA E5 [DATASHEET] 87
Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014