4. Clock Pulse Generators
Rev.3.00 Jul. 19, 2007 page 97 of 532
REJ09B0397-0300
Figure 4.8 shows the equivalent circuit of the 32.768-kHz crystal oscillator.
C
S
C
0
L
R
S
X
1
X
2
C = 1.5 pF typ
R = 14 k
Ω
typ
f = 32.768 kHz
Crystal oscillator:
0
S
W
S
MX38T
(Nihon Denpa Kogyo)
Figure 4.8 Equivalent Circuit of 32.768-kHz Crystal Oscillator
Inputting an External Clock
•
Circuit configuration
An external clock is input to the X
1
pin. The X
2
pin should be left open.
An example of the connection in this case is shown in figure 4.9.
X
X
1
2
Open
External clock input
Figure 4.9 Example of Connection when Inputting an External Clock
•
External clock
Input a square waveform to the X1 pin. When using the CPU, timer A, timer C*, or an LCD,
with a subclock (
φ
w) clock selected, do not stop the clock supply to the X
1
pin.
Note: * This is a function of the H8/3857 Group only, and is not provided in the H8/3854
Group.
Summary of Contents for F-ZTAT H8 Series
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