ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 325

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

28.4
28.4.1
Table 28-11. Calibration Accuracy of Internal RC Oscillator
Notes:
28.4.2
28.4.3
8285D–AVR–06/11
Factory Calibration
User Calibration
Clock Characteristics
1. Voltage range for ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P.
Calibrated Internal RC Oscillator Accuracy
External Clock Drive Waveforms
External Clock Drive
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Figure 28-3. External Clock Drive Waveforms
Table 28-12. External Clock Drive
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
7.3 - 8.1MHz
Frequency
8.0MHz
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
V
IL1
V
IH1
1.8V - 5.5V
V
3V
1000
Min.
400
400
V
CC
0
CC
=1.8-5.5V
(1)
Max.
2.0
2.0
4
2
Min.
100
V
Temperature
40
40
-40°C - 85°C
0
CC
=2.7-5.5V
25°C
Max.
1.6
1.6
10
2
Min.
V
50
20
20
0
CC
Calibration Accuracy
=4.5-5.5V
Max.
±10%
0.5
0.5
20
±1%
2
Units
MHz
ns
ns
ns
μs
μs
%
325