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4. Clock Pulse Generators
Inputting an External Clock: When inputting an external clock, connect it to the OSC
resistance R, and leave the OSC
An example of the connection in this case is shown in figure 4.6.
Figure 4.6 Example of Connection when Inputting an External Clock
Frequency
Duty
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.
Figure 4.7 Typical Connection to 32.768-kHz Crystal Oscillator
Rev.3.00 Jul. 19, 2007 page 96 of 532
REJ09B0397-0300
pin open.
2
R
OSC
1
OSC
2
OSC clock (φ
)
osc
45% to 55%
X
1
X
2
External clock input
Open
R = 500 Ω ±30%
C
1
C = C
C
1
2
2
= 15 pF (typ.)
pin via a
1
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