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