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External Clock: The external clock frequency should be equal to the system clock frequency (ø).
Table 15-3 and figure 15-6 indicate the clock timing.
Table 15-3 Clock Timing
Item
Symbol
External clock rise
t
EXr
time
External clock fall
t
EXf
time
External clock
—
input duty (a/t
)
cyc
ø clock duty
—
(b/t
)
cyc
EXTAL
t
EXr
ø
Figure 15-6 External Clock Input Timing
V
=
CC
2.7 V to 5.5 V
V
= 5.0 V ± 10%
CC
Min
Max
Min
Max
—
10
—
5
—
10
—
5
30
70
30
70
40
60
40
60
40
60
40
60
t
cyc
a
t
EXf
t
cyc
b
409
Unit Test Conditions
ns
Figure 15-16
ns
ø ≥ 5 MHz
%
Figure
15-6
%
ø < 5 MHz
%
Figure 15-6
× 0.5
V
CC
× 0.5
V
CC
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