4 clock characteristics, 1 calibrated internal rc oscillator accuracy, 5 external clock drive characteristics – Rainbow Electronics ATmega64M1 User Manual
Page 312: Frequencies as specified in, Table 29
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312
8209A–AVR–08/09
ATmega16M1/32M1/64M1
29.4
Clock Characteristics
29.4.1
Calibrated Internal RC Oscillator Accuracy
29.5
External Clock Drive Characteristics
Figure 29-2. External Clock Drive Waveforms
Table 29-1.
Calibration Accuracy of Internal RC Oscillator
Frequency
V
CC
Temperature Calibration
Accuracy
Factory
Calibration
8.0 MHz
3V
25
°
C
±1%
User
Calibration
7.3 - 8.1 MHz
2.7V - 5.5V
-40
°
C to +85
°
C
±10%
Table 1. External Clock Drive
Symbol
Parameter
V
CC
= 2.7 - 5.5V
V
CC
= 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
1/t
CLCL
Oscillator Frequency
0
8
0
16
MHz
t
CLCL
Clock Period
125
62.5
ns
t
CHCX
High Time
50
25
ns
t
CLCX
Low Time
50
25
ns
t
CLCH
Rise Time
1.6
0.5
μ
s
t
CHCL
Fall Time
1.6
0.5
μ
s
Δ
t
CLCL
Change in period from one clock cycle
to the next
2
2
%
V
IL1
V
IH1
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