ATMEGA165P_14 Datasheet, PDF (301/364 Pages) ATMEL Corporation – High Performance, Low Power Atmel

ATmega165P
26.4 Clock Characteristics
26.4.1 Calibrated Internal RC Oscillator Accuracy
Table 26-2. Calibration Accuracy of Internal RC Oscillator
Factory Calibration
User Calibration
Frequency
8.0 MHz
7.3 MHz - 8.1 MHz
V_CC
3V
1.8V - 5.5V⁽¹⁾
2.7V - 5.5V⁽²⁾
Notes: 1. Voltage range for ATmega165PV.
2. Voltage range for ATmega165P.
26.4.2 External Clock Drive Waveforms
Figure 26-3. External Clock Drive Waveforms
Temperature
25°C
-40°C - 85°C
Calibration Accuracy
±10%
±1%
V_IH1
V_IL1
26.4.3 External Clock Drive
Table 26-3. External Clock Drive
Symbol Parameter
V_CC = 1.8V - 5.5V
Min. Max.
1/t_CLCL
Oscillator
Frequency
0
1
t_CLCL
Clock Period
1000
t_CHCX
High Time
400
t_CLCX
Low Time
400
t_CLCH
Rise Time
2.0
t_CHCL
Fall Time
2.0
Change in period
Δt_CLCL
from one clock
2
cycle to the next
V_CC = 2.7V - 5.5V
Min. Max.
0
8
125
50
50
1.6
1.6
2
V_CC = 4.5V - 5.5V
Min. Max.
0
16
62.5
25
25
0.5
0.5
2
Units
MHz
ns
μs
%
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