h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 605

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

20.6.2
If no subclock is required, connect the OSC1 pin to Vss and leave the OSC2 pin open, as shown in
figure 20.8.
20.7
To eliminate noise from the subclock input from the OSC1 pin, the subclock is sampled using the
dividing clock φ. The sampling frequency is set using the NESEL bit in LPWRCR. For details, see
section 21.1.2, Low-Power Control Register (LPWRCR).
No sampling is performed in subactive, subsleep, and watch mode.
20.8
20.8.1
As various characteristics related to the crystal resonator are closely linked to the user's board
design, thorough evaluation is necessary on the user's part, using the resonator connection
examples shown in this section as a guide. As the resonator circuit ratings will depend on the
floating capacitance of the resonator and the mounting circuit, the ratings should be determined in
consultation with the resonator manufacturer. The design must ensure that a voltage exceeding the
maximum rating is not applied to the oscillator pin.
Handling Pins when Subclock is not Used
Subclock Waveform Generation Circuit
Usage Notes
Note on Crystal Resonator
Figure 20.8 Pin Handling when Subclock is not Used
OSC2
OSC1
Rev. 2.00 Dec. 05, 2005 Page 567 of 724
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Section 20 Clock Pulse Generator
REJ09B0200-0200