Rev. 6.00, 08/04, page 109 of 628
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
X
C
1
C
2
1
2
C = C = 15 pF (typ.)
1
2
Frequency
38.4 kHz
32.768 kHz
Crystal oscillator
Seiko Instrument Inc.
Nihon Denpa Kogyo
Products Name
VTC-200
MX73P
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.
C
S
C
0
L
R
S
X
1
X
2
C = 1.5 pF typ
R = 14 k typ
f = 32.768 kHz/38.4 kHz
0
S
W
Ω
S
Figure 4.9 Equivalent Circuit of 32.768 kHz/38.4 kHz Crystal Oscillator
Содержание H8/38024 Series
Страница 18: ...Rev 6 00 08 04 page xviii of xxx...
Страница 30: ...Rev 6 00 08 04 page xxx of xxx...
Страница 130: ...Rev 6 00 08 04 page 100 of 628...
Страница 216: ...Rev 6 00 08 04 page 186 of 628...
Страница 416: ...Rev 6 00 08 04 page 386 of 628...
Страница 432: ...Rev 6 00 08 04 page 402 of 628...
Страница 468: ...Rev 6 00 08 04 page 438 of 628...
Страница 661: ...H8 38024 H8 38024S H8 38024F ZTAT H8 38124 Group Hardware Manual...