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9.7
Subclock Oscillator Circuit
9.7.1
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 9.8.
For precautions on connecting, see Note on Board Design, in section 9.3.1 Connecting a Crystal
Resonator.
Figure 9.8 Connecting a 32.768 kHz Crystal Resonator (Example)
Figure 9.9 shows a crystal resonator equivalent circuit.
Note: Values shown are the reference values.
Figure 9.9 32.768 kHz Crystal Resonator Equivalent Circuit
Rev. 1.0, 02/00, page 182 of 1141
X1
X2
L
s
X1
C
1
C
C
= C
2
1
C
S
R
s
C
= 1.5 pF (Typ)
C
0
0
R
= 14 kΩ (Typ)
S
f
= 32.768 kHz
W
Type: MX38T (Nihon Denpa Kogyo Co., Ltd.)
= 15 pF (Typ)
2
X2
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