HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 1026

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 23 Clock Pulse Generator
23.2
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
23.2.1
A crystal resonator can be connected as shown in the example in figure 23.2. Select the damping
resistance R
Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 23.2. When a crystal resonator is used, the range of its
frequencies is from 8 to 25 MHz.
Table 23.1 Damping Resistance Value
Frequency (MHz)
R
Rev.7.00 Mar. 18, 2009 page 958 of 1136
REJ09B0109-0700
d
(Ω)
Oscillator
Connecting a Crystal Resonator
d
according to table 23.1. An AT-cut parallel-resonance type should be used.
Note: * CL1 = CL2 = 10 pF on the H8S/2378 0.18µm F-ZTAT Group and
EXTAL
XTAL
Figure 23.2 Connection of Crystal Resonator (Example)
XTAL
Figure 23.3 Crystal Resonator Equivalent Circuit
H8S/2378R 0.18µm F-ZTAT Group
8
200
R
d
L
C
C
12
0
C
C
L1
L2
L
0
AT-cut parallel-resonance type
R
s
16
0
C
L1
= C
EXTAL
L2
= 10 to 22 pF*
20
0
25
0