h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 534

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 20 Clock Pulse Generator
20.2
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock. In
either case, the input clock should not exceed 24 MHz.
20.2.1
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
20.2. Select the damping resistance R
crystal should be used.
Table 20.1 Damping Resistance Value
Figure 20.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 20.2.
Rev. 3.00 Oct 04, 2005 page 494 of 598
REJ09B0155-0300
Frequency (MHz)
R
d
( )
Connecting a Crystal Resonator
Oscillator
Figure 20.2 Connection of Crystal Resonator (Example)
EXTAL
XTAL
XTAL
Figure 20.3 Crystal Resonator Equivalent Circuit
4
500
R
d
L
d
8
200
according to table 20.1. An AT-cut parallel-resonance
C
C
C
C
L1
L2
L
0
AT-cut parallel-resonance type
10
0
R
s
C
L1
12
0
EXTAL
= C
L2
= 22 to 10 pF
16
0
20
0
24
0