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Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet

Product codes
MEGA328P-XMINI
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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
Atmel-8271H-AVR- ATmega-Datasheet_08/2014
29.4
Clock Characteristics
29.4.1 Calibrated Internal RC Oscillator Accuracy
29.4.2 External Clock Drive Waveforms
Figure 29-2.
External Clock Drive Waveforms
29.4.3 External Clock Drive
Table 29-14.
Calibration Accuracy of Internal RC Oscillator
Frequency
V
CC 
Temperature Calibration 
Accuracy
Factory
Calibration
8.0MHz
3V
25
C
±10%
User
Calibration
7.3 - 8.1MHz
1.8V - 5.5V
-40
C - 85C
±1%
V
IL1
V
IH1
Table 29-15.
External Clock Drive
Symbol
Parameter
V
CC
= 1.8 - 5.5V
V
CC
= 2.7 - 5.5V
V
CC
= 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
Min.
Max.
1/t
CLCL
Oscillator Frequency
0
4
0
10
0
20
MHz
t
CLCL
Clock Period
250
100
50
ns
t
CHCX
High Time
100
40
20
ns
t
CLCX
Low Time
100
40
20
ns
t
CLCH
Rise Time
2.0
1.6
0.5
s
t
CHCL
Fall Time
2.0
1.6
0.5
s
t
CLCL
Change in period from 
one clock cycle to the 
next
2
2
2
%