HD6412350 Hitachi, HD6412350 Datasheet - Page 680

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

19.3
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
19.3.1
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
19-2. Select the damping resistance R
crystal should be used.
Table 19-2 Damping Resistance Value
Frequency (MHz)
R
Crystal Resonator: Figure 19-3 shows the equivalent circuit of the crystal resonator. Use a
crystal resonator that has the characteristics shown in table 19-3 and the same resonance frequency
as the system clock (ø).
660
d
( )
Oscillator
Connecting a Crystal Resonator
Figure 19-2 Connection of Crystal Resonator (Example)
XTAL
EXTAL
XTAL
Figure 19-3 Crystal Resonator Equivalent Circuit
2
1k
R
d
L
d
according to table 19-2. 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