atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 399

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

30.3
30.4
30.5
7766A–AVR–03/08
External Clock Drive Waveforms
External Clock Drive
Maximum speed vs. V
Figure 30-1. External Clock Drive Waveforms
Table 30-1.
Note:
Maximum frequency is depending on V
V
Symbol
CC
1/t
Δ
t
t
t
t
t
CHCX
CLCX
CLCH
CHCL
CLCL
t
CLCL
CLCL
curve is linear between 2.7V < V
All DC Characteristics contained in this datasheet are based on simulation and characterization of
other AVR microcontrollers manufactured in the same process technology. These values are pre-
liminary values representing design targets, and will be updated after characterization of actual
silicon.
CC
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
External Clock Drive
V
IL1
V
IH1
Min.
V
500
200
200
CC
0
=1.8-5.5V
CC
CC.
Max.
< 5.5V.
2.0
2.0
2
2
As shown in
Min.
V
125
50
50
CC
0
=2.7-5.5V
Figure
Max.
1.6
1.6
8
2
30-2, the Maximum Frequency vs.
V
Min.
62.5
25
25
CC
0
=4.5-5.5V
ATmega32U4
Max.
0.5
0.5
16
2
Units
MHz
ns
ns
ns
μs
μs
%
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