HD6432646 Hitachi, HD6432646 Datasheet - Page 756

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

21.7
Connecting 32.768kHz Quartz Oscillator: To supply a clock to the subclock divider, connect a
32.768kHz quartz oscillator, as shown in figure 21-6. See section 21.3.1, “Notes on Board Design”
for notes on connecting quartz oscillators.
Figure 21-7 shows the equivalence circuit for a 32.768kHz oscillator.
Handling pins when subclock not required: If no subclock is required, connect the OSC1 pin to
Vss and leave OSC2 open, as shown in figure 21-8.
722
OSC1
Subclock Oscillator
Figure 21-6 Example Connection of 32.768kHz Quartz Oscillator
Note: * C
Figure 21-7 Equivalence Circuit for 32.768kHz Oscillator
Figure 21-8 Pin Handling When Subclock Not Required
OSC2
OSC1
1
and C
L
2
s
are reference values that include the wiring capacity.
OSC2
OSC1
C
s
C
C
1
2
C
o
C
Open
1
=C
2
R
=15pF (typ)*
s
OSC2