Datasheet

Section 23 Clock Pulse Generator
Page 1208 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
Table 23.3 External Clock Input Conditions
Vcc = 3.0 V to 3.6 V
Item Symbol Min Max Unit Test Conditions
External clock input
low pulse width
t
EXL
20 ⎯ ns Figure 23.5
External clock input
high pulse width
t
EXH
20 ⎯ ns
External clock rise time t
EXr
⎯ 5 ns
External clock fall time t
EXf
⎯ 5 ns
Clock low pulse width t
CL
0.4 0.6 t
cyc
Clock high pulse width t
CH
0.4 0.6 t
cyc
t
EXH
t
EXL
t
EXr
t
EXf
V
CC
× 0.5
EXTAL
Figure 23.5 External Clock Input Timing