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H8/300H Datasheet(PDF) 102 Page - Renesas Technology Corp

Part # H8/300H
Description  Renesas 16-Bit Single-Chip Microcomputer
PDF  552 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/300H Datasheet(HTML) 102 Page - Renesas Technology Corp

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Section 4 Clock Pulse Generators
Rev. 3.00 May 15, 2007 Page 70 of 516
REJ09B0152-0300
4.3.3
External Clock Input Method
Connect the external clock to the X1 pin and leave the X2 pin open, as shown in figure 4.8.
X1
External clock input
X2
Open
Figure 4.8 Pin Connection when Inputting External Clock
Frequency
Watch Clock (
φ
W)
Duty
45% to 55%
4.3.4
On-Chip Oscillator Selection Method
The on-chip oscillator is selected by the SUBSEL bit in OSCCR. When the on-chip oscillator is
selected, a resonator no longer needs to be connected to the X1 and X2 pins. In such a case, fix the
X1 pin at GND.



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