722
21.7
Subclock Oscillator
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.
OSC1
OSC2
C
1
C
2
C
1
=C
2
=15pF (typ)
*
Note:
*
C
1
and C
2
are reference values that include the wiring capacity.
Figure 21-6 Example Connection of 32.768kHz Quartz Oscillator
Figure 21-7 shows the equivalence circuit for a 32.768kHz oscillator.
OSC1
OSC2
C
s
L
s
R
s
C
o
Figure 21-7 Equivalence Circuit for 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.
OSC1
OSC2
Open
Figure 21-8 Pin Handling When Subclock Not Required
Содержание H8S/2645
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