r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 99

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

4.8
4.8.1
A sufficient evaluation at the user’s site is necessary to use the LSI, by referring the resonator
connection examples shown in this section, because various characteristics related to the crystal
resonator are closely linked to the user’s board design. As the oscillator circuit's circuit constant
will depend on the resonator and the floating capacitance of the mounting circuit, the value of each
external circuit’s component 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.
4.8.2
Measures against radiation noise are taken in this LSI. If further reduction in radiation noise is
needed, it is recommended to use a multiple layer board and provide a layer exclusive to the
system ground.
When using a crystal resonator, place the crystal resonator and its load capacitors as close as
possible to the XTAL and EXTAL pins. Do not route any signal lines near the oscillator circuitry
as shown in figure 4.5. Otherwise, correct oscillation can be interfered by induction.
Usage Notes
Note on Crystal Resonator
Notes on Board Design
Figure 4.5 Cautions for Oscillator Circuit Board Design
Avoid
C
C
L2
L1
Signal A Signal B
XTAL
EXTAL
This LSI
Rev. 1.00 Sep. 21, 2007 Page 73 of 1124
Section 4 Clock Pulse Generator (CPG)
REJ09B0402-0100