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10.7
Subclock Oscillator Circuit
10.7.1
Connecting 32.768 kHz Crystal Resonator
When using a subclock, connect a 32.768 kHz crystal resonator to X1 and X2 pins as shown in
figure 10.8.
For precautions on connecting, see section 10.3.1 (3), Note on Board Design.
The subclock input conditions are shown in figure 10.10.
Figure 10.8 Connecting a 32.768 kHz Crystal Resonator (Example)
Figure 10.9 shows a crystal resonator equivalent circuit.
Figure 10.9 32.768 kHz Crystal Resonator Equivalent Circuit
Rev. 2.0, 11/00, page 232 of 1037
X1
X2
X1
Note: Values shown are the reference values.
C
1
C
C
= C
2
1
C
S
L
R
s
s
C
= 1.5 pF (Typ)
C
0
0
R
= 14 k
S
f
= 32.768 kHz
W
= 15 pF (Typ)
2
X2
(Typ)
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