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4.3
Subclock Generator
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 4.8. Follow the same precautions as noted under 3. notes on board
design for the system clock in section 4.2.
Note that only operation at 32.768 kHz is guaranteed on the H8/38124 Group.
X
1
X
2
Figure 4.8 Typical Connection to 32.768 kHz/38.4 kHz Crystal Oscillator (Subclock)
Figure 4.9 shows the equivalent circuit of the 32.768 kHz/38.4 kHz crystal oscillator.
X
1
Figure 4.9 Equivalent Circuit of 32.768 kHz/38.4 kHz Crystal Oscillator
C
1
C = C
1
2
Frequency
38.4 kHz
C
2
32.768 kHz
C
S
L
S
C
= 15 pF (typ.)
Crystal oscillator
Seiko Instrument Inc.
Nihon Denpa Kogyo
R
S
C = 1.5 pF typ
0
0
Ω
R = 14 k
typ
S
f
= 32.768 kHz/38.4 kHz
W
Rev. 6.00, 08/04, page 109 of 628
Products Name
VTC-200
MX73P
X
2
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