4. Clock Pulse Generators
Rev.3.00 Jul. 19, 2007 page 96 of 532
REJ09B0397-0300
Inputting an External Clock:
When inputting an external clock, connect it to the OSC
1
pin via a
resistance R, and leave the OSC
2
pin open.
An example of the connection in this case is shown in figure 4.6.
OSC
1
OSC
2
R
Open
External clock input
R = 500
Ω
±
30
%
Figure 4.6 Example of Connection when Inputting an External Clock
Frequency
OSC clock (
φ
osc
)
Duty
45
%
to 55
%
4.3 Subclock
Generator
Connecting a 32.768-kHz Crystal Oscillator:
Clock pulses can be supplied to the subclock
divider by connecting a 32.768-kHz crystal oscillator, as shown in figure 4.7. Following the same
connection precautions as mentioned in Notes on Board Design in section 4.2, System Clock
Generator.
X
X
C
1
C
2
1
2
C = C = 15 pF (typ.)
1
2
Figure 4.7 Typical Connection to 32.768-kHz Crystal Oscillator
Содержание F-ZTAT H8 Series
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