h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 688

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 24 Clock Pulse Generator
24.1
Clock pulses can be supplied either by connecting a crystal resonator, or by providing external
clock input.
24.1.1
Figure 24.2 shows a typical method of connecting a crystal resonator. An appropriate damping
resistance R
should be used.
Figure 24.3 shows the equivalent circuit of a crystal resonator. A resonator having the
characteristics given in table 24.2 should be used.
A crystal resonator with frequency identical to that of the system clock ( ) should be used.
Table 24.1 Damping Resistance Values
Frequency (MHz)
R
Rev. 3.00 Mar 21, 2006 page 634 of 788
REJ09B0300-0300
d
( )
Oscillator
Connecting Crystal Resonator
d
, given in table 24.1, should be used. An AT-cut parallel-resonance crystal resonator
XTAL
Figure 24.2 Typical Connection to Crystal Resonator
Figure 24.3 Equivalent Circuit of Crystal Resonator
2
1 k
EXTAL
XTAL
L
R
4
500
d
C
C
L
0
C
C
AT-cut parallel-resonance crystal resonator
L1
L2
8
200
R
s
EXTAL
10
0
C
L1
= C
L2
= 10 to 22 pF
12
0
16
0
20
0