Hitachi H8S/2633 Hardware Manual page 862

External Clock
Table 23-4 and figure 23-7 show the input conditions for the external clock.
Table 23-4 External Clock Input Conditions
Item
External clock input low
pulse width
External clock input
high pulse width
External clock rise time t
External clock fall time
Clock low pulse
width level
Clock high pulse width
level
EXTAL
848
V = 3.0 V
CC
to 3.6 V,
PV = 3.0 V
CC
to 5.5 V
Symbol Min
t 20
EXL
t 20
EXH
—
EXr
t —
EXf
t 0.4
CL
80
t 0.4
CH
80
t
EXH
t
EXr
Figure 23-7 External Clock Input Timing
V = 3.0 V
CC
to 3.6 V
PV = 5.0 V
CC
±10%
Max Min Max
— 15 —
— 15 —
10 — 5
10 — 5
0.6 0.4 0.6
— 80 —
0.6 0.4 0.6
— 80 —
t
EXL
t
EXf
Unit Test Conditions
ns Figure 23-7
ns
ns
ns
ø ≥ 5 MHz Figure
t
cyc
ns ø < 5 MHz
ø ≥ 5 MHz
t
cyc
ns ø < 5 MHz
× 0.5
V
CC
25-2