HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 622

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

18.3
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
18.3.1
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
18.2. Select the damping resistance R
crystal should be used.
Table 18.2 Damping Resistance Value
Frequency (MHz)
R
Crystal Resonator: Figure 18.3 shows the equivalent circuit of the crystal resonator. Use a crystal
resonator that has the characteristics shown in table 18.3 and the same resonance frequency as the
system clock (ø).
d
( )
Oscillator
Connecting a Crystal Resonator
Figure 18.2 Connection of Crystal Resonator (Example)
XTAL
EXTAL
XTAL
Figure 18.3 Crystal Resonator Equivalent Circuit
2
1k
R
d
L
d
according to table 18.2. An AT-cut parallel-resonance
4
500
C
C
C
C
L
0
L1
L2
AT-cut parallel-resonance type
R
s
8
200
C
L1
= C
EXTAL
12
0
L2
= 10 to 22pF
16
0
20
0
611