HD6473032F Datasheet, PDF (424/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

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
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 V to 5.5 V
Symbol Min Max
t_EXr
—
10
t_EXf
—
10
—
30
70
40
60
—
40
60
V_CC = 5.0 V ± 10%
Min
Max
Unit Test Conditions
—
5
ns Figure 15-16
—
5
ns
30
70
40
60
40
60
% ø ≥ 5 MHz Figure
% ø < 5 MHz ^15-6
% Figure 15-6
EXTAL
t_cyc
a
VCC × 0.5
t_EXr
t_EXf
tcyc
b
ø
VCC × 0.5
Figure 15-6 External Clock Input Timing
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