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470
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Figure 29-235.Atmel ATmega644A: Calibrated 8MHz RC oscillator vs. temperature.
Figure 29-236.Atmel ATmega644A: Calibrated 8MHz RC oscillator vs. OSCCAL value.
5.0V
3.0V
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
-40
-30
-20
-10
0
10
20
30405060
70
80
90
100 110 120
Temperature [°C]
F
RC
[MHz]
85°C
25°C
-40°C
0
2
4
6
8
10
12
14
16
016
3248
64
8096
112
128
144
160
176
192
208
224
240
OSCCAL [X1]
F
RC
[MHz]