H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 716

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 19 Clock Pulse Generator
External Clock
The external clock signal should have the same frequency as the system clock ( ).
Table 19.4 and figure 19.6 show the input conditions for the external clock.
Table 19.4 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
Rev. 3.00 Sep 15, 2006 page 682 of 988
REJ09B0330-0300
EXTAL
t
EXr
Symbol
t
t
t
t
t
EXL
EXH
EXr
EXf
CL
CH
Figure 19.6 External Clock Input Timing
V
to 5.5 V
Min
40
40
—
—
0.4
80
0.4
80
CC
t
EXH
= 2.7 V
Max
—
—
0.6
—
0.6
—
10
10
Min
20
20
—
—
0.4
80
0.4
80
V
±10%
CC
= 5.0 V
Max
—
—
5
5
0.6
—
0.6
—
t
EXf
t
EXL
Unit
ns
ns
ns
ns
t
ns
t
ns
cyc
cyc
Test Conditions
Figure 19.6
< 5 MHz
< 5 MHz
5 MHz
5 MHz
V
CC
0.5
Figure 21.4