atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 312

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

25.3
25.3.1
Table 25-1.
25.4
25.5
312
Factory
Calibration
User
Calibration
Clock Characteristics
External Clock Drive Characteristics
Maximum Speed vs. V
ATmega32/64/M1/C1
Calibrated Internal RC Oscillator Accuracy
Calibration Accuracy of Internal RC Oscillator
Figure 25-1. External Clock Drive Waveforms
Table 2. External Clock Drive
Maximum frequency is depending on V
equals 8MHz when V
and 5.5V.
Symbol
1/t
t
t
t
t
t
∆
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
7.3 - 8.1 MHz
Frequency
8.0 MHz
CC
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
CC
V
is between 2.7V and 4.5V and equals 16MHz when V
IH1
2.7V - 5.5V
V
3V
CC
CC.
As shown in
V
Min.
125
CC
50
50
-40°C - 125°C
0
Temperature
= 2.7 - 5.5V
Figure 25-2
25°C
Max.
1.6
1.6
8
2
, the Maximum Frequency
V
Min.
62.5
CC
25
25
0
Calibration Accuracy
= 4.5 - 5.5V
CC
is between 4.5V
Max.
±10%
0.5
0.5
16
±1%
2
7647A–AVR–02/08
Units
MHz
ns
ns
ns
µs
µs
%