h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 820

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 26 Clock Pulse Generator
of the PLL circuit output clock. For details, see section 18.3.17, USB PLL Control Register
(UPLLCR).
The 24-MHz clock generated by the PLL circuit can also be used as the system clock. For details,
see section 27.1.3, System Control Register 2 (SYSCR2).
To activate the PLL circuit, first clear the SMSTPB1 bit in SUBMSTPBL to 0, then after clearing
the USB module stop mode, make settings for UPLLCR. If the USB module is not used, after
activating the PLL circuit, set the SMSTPB1 bit in SUBMSTPBL to 1 to make the USB module
enter module stop mode.
26.9
26.9.1
Since all kinds of characteristics of the resonator are closely related to the board design by the
user, use the example of resonator connection in this document for only reference; be sure to use
an resonator that has been sufficiently evaluated by the user. Consult with the resonator
manufacturer about the resonator circuit ratings which vary depending on the stray capacitances of
the resonator and installation circuit. Make sure the voltage applied to the oscillation pins do not
exceed the maximum rating.
26.9.2
When using a crystal resonator, the crystal resonator and its load capacitors should be placed as
close as possible to the EXTAL and XTAL pins. Other signal lines should be routed away from
the oscillation circuit to prevent inductive interference with the correct oscillation as shown in
figure 26.8.
Rev. 3.00 Jan 25, 2006 page 768 of 872
REJ09B0286-0300
Usage Notes
Note on Resonator
Notes on Board Design
Figure 26.8 Note on Board Design of Oscillation Circuit Section
Prohibited
C
C
L2
L1
Signal A Signal B
XTAL
EXTAL
This LSI