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SH7052 Datasheet(PDF) 85 Page - Renesas Technology Corp

Part # SH7052
Description  SuperHTM RISC engine
PDF  919 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7052 Datasheet(HTML) 85 Page - Renesas Technology Corp

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59
XTAL
EXTAL
Open
External clock input
Figure 4.5 External Clock Input Method (Example)
4.4
Usage Notes
Notes on Board Design: When connecting a crystal oscillator, observe the following precautions:
• To prevent induction from interfering with correct oscillation, do not route any signal lines
near the oscillator circuitry (figure 4.6).
• When designing the board, place the crystal oscillator and its load capacitors as close as
possible to the XTAL and EXTAL pins.
Figure 4.6 shows the precautions regarding oscillator circuit system board design.
Crossing of signal
lines prohibited
CL1
XTAL
EXTAL
CL2
Figure 4.6 Precautions for Oscillator Circuit System Board Design
PLL Oscillation Power Supply: Place oscillation capacitor C1 and resistor R1 close to the PLL
CAP pin, and ensure that no other signal lines cross this line. Supply the C1 ground from PLLV
SS.
Separate PLLV
CC and PLLVSS from the other VCC and VSS lines at the board power supply source,
and be sure to insert bypass capacitors C
PB and CB close to the pins.



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