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4.3
Subclock Generator
1. Connecting a 32.768-kHz/38.4 kHz crystal oscillator
Clock pulses can be supplied to the subclock divider by connecting a 32.768-kHz/38.4 kHz crystal
oscillator, as shown in figure 4.7. Follow the same precautions as noted under 3. notes on board
design for the system clock in 4.2.
X
1
X
2
Figure 4.7 Typical Connection to 32.768-kHz/38.4 kHz Crystal Oscillator (Subclock)
Figure 4.8 shows the equivalent circuit of the 32.768-kHz/38.4 kHz crystal oscillator.
X
1
Figure 4.8 Equivalent Circuit of 32.768-kHz/38.4 kHz Crystal Oscillator
C = C
1
2
C
1
Oscillation
frequency
32.768 kHz
C
38.4 kHz
2
C
S
L
S
C
= 15 pF (typ.)
Manufacturer
Nihon Denpa Kogyo
Seiko Instrument Inc.
R
S
C = 1.5 pF typ
0
0
Ω
R = 14 k
typ
S
f
= 32.768 kHz/38.4kHz
W
Products Name
MX73P
VTC-200
X
2
91
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