HD64F2636F20 Datasheet, PDF (972/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 22B Clock Pulse Generator
(H8S/2639 Group, H8S/2635 Group)
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
External Clock
Table 22B-4 and figure 22B-7 show the input conditions for the external clock.
Table 22B-4 External Clock Input Conditions
Item
External clock input
low pulse width
External clock input
high pulse width
External clock rise time
External clock fall time
Symbol
tEXL
tEXH
tEXr
tEXf
VCC = 5.0 V ±10%
Min.
Max.
50
—
50
—
—
5
—
5
Unit Test Conditions
ns Figure 22B-7
ns
ns
ns
EXTAL
t_EXH
t_EXL
V_CC × 0.5
t_EXr
t_EXf
Figure 22B-7 External Clock Input Timing
Page 922 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010