HD6413002 Datasheet, PDF (522/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

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