SH7604 Datasheet, PDF (69/633 Pages) Hitachi Semiconductor – Hardware Manual

CKPREQ/CKM
CKIO
EXTAL
XTAL
High level
The CKIO pin is an output in clock
modes 0,1, and 2. In mode 3,
it is high impedance.
Output or high
impedance
CL1
CL2
CL1 = CL2 = 18 pF–22 pF
Rd
Figure 3.2 Example of Crystal Resonator Connection
Table 3.4 Damping Resistance (Reference Values)
Frequency (MHz)
4
6
8
Rd (Ω)
500
200
0
Crystal Resonator: Figure 3.3 shows a crystal resonator equivalent circuit. Use a crystal
resonator that has the characteristics shown in table 3.5.
L
CL
Rs
EXTAL
Co
Figure 3.3 Crystal Resonator Equivalent Circuit
Table 3.5 Crystal Resonator Characteristics (Reference Values)
Parameters
4
Rs max (Ω)
120
Co max (pF)
Frequency (MHz)
6
8
100
80
7 pF max
53