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External Clock Drive
Waveforms
ATmega161(L)
130
Figure 83. External Clock
VIH1
VIL1
Table 50. External Clock Drive
Symbol
Parameter
1/t
Oscillator Frequency
CLCL
t
Clock Period
CLCL
t
High Time
CHCX
t
Low Time
CLCX
t
Rise Time
CLCH
t
Fall Time
CHCL
Notes:
1. See "External Data Memory Timing" for a description of how the duty cycle influences
the timing for the external data memory.
(1)
5.5
V
= 2.7V to
V
CC
Min
Max
0
4
250
100
100
1.6
1.6
5.5
V
= 4.0V to
V
CC
Min
Max
Units
0
8
MHz
125
ns
50
ns
50
ns
0.5
µs
0.5
µs
1228B–09/01
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