ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 328

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

External Clock Drive
Waveforms
External Clock Drive
328
ATmega64(L)
Figure 155. External Clock Drive Waveforms
Table 132. External Clock Drive
Note:
Table 133. External RC Oscillator, Typical Frequencies
Note:
Symbol
1/t
t
t
t
t
t
∆
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
1. Refer to “External Clock” on page 41 for details.
1. R should be in the range 3kΩ - 100kΩ, and C should be at least 20 pF. The C values
V
given in the table includes pin capacitance. This will vary with package type.
IL1
R [kΩ]
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period from
one clock cycle to the
next
31.5
100
6.5
V
IH1
(1)
(1)
V
CC
Min
125
50
50
0
= 2.7V to
C [pF]
70
20
20
Max
1.6
1.6
5.5
8
2
V
V
62.5
CC
Min
25
25
0
= 4.5V to
Max
0.5
0.5
16
5.5
2
TBD
TBD
TBD
2490G–AVR–03/04
f
V
Units
MHz
ns
ns
ns
µs
µs
%