SH7052 datasheet(85/919 Pages) RENESAS

tên linh kiện	SH7052

Giải thích chi tiết về linh kiện	SuperHTM RISC engine

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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.

SH7052 bảng dữ liệu(PDF) 85 Page - Renesas Technology Corp